Putin admits China has 'concerns' over Ukraine invasion; Russia's Wagner Group recruiting convicts

This is CNBC's live blog tracking developments on the war in Ukraine. See below for the latest updates. 

Investigators find more than 440 bodies at mass grave in Ukraine
Investigators find more than 440 bodies at mass grave in Ukraine

Signs of tension have emerged between allies Russia and China, as Putin acknowledged his Chinese counterpart Xi Jinping's "questions and concerns" about Russian operations in Ukraine during the leaders' first in-person meeting since the war began on Feb. 24.

There are reports of mass graves outside the cities recently recaptured by Ukrainian forces after months of Russian occupation, Ukrainian officials and international media present on the scene have said.

Meanwhile, Berlin is taking control of Russian energy giant Rosneft's German operations, citing the need to protect the continuity of business operations and ensure its energy security.

Two NASAMS air defense systems will arrive in Ukraine by mid-November

The Pentagon updated its timeline for the transfer of two National Advanced Surface-to-Air Missile Systems (NASAMS) to Ukraine, saying they would arrive within two months, or by mid-November.

"We're tracking that two NASAMS are expected to be delivered within the next two months or so," said Pentagon press secretary Brigadier Gen. Patrick Ryder.

"These defensive systems will further contribute to protecting Ukrainians from enemy air threats, including aircraft, unmanned aerial vehicles and missiles."

The NASAMS is one of the most highly anticipated weapons systems that has been committed to the Ukrainian military thus far in the war.

Developed by Raytheon and Norway's Kongsberg, it is orders of magnitude more advanced than the Russian-made air defense systems that Ukraine has used in the past, notably the S-300.

It also represents a major step for Ukraine's military toward a longer-term cooperation with Western allies.

NASAMS "is a NATO system, so for us it's important to start to help the Ukrainians transition their air defense systems from what is a now a Soviet-type system, to introduce some of this modern technology," a senior Defense Department official said in July.

-- Christina Wilkie

'The president is not going to let up,' White House says on bringing Brittney Griner and Paul Whelan home

White House National Security Council Strategic Communications Coordinator John Kirby addresses the daily press briefing at the White House in Washington, July 27, 2022.
Jonathan Ernst | Reuters

The Biden administration is not going to let up in its efforts to bring WNBA star Brittney Griner and former U.S. Marine Paul Whelan home, a White House spokesman said.

"Discussions are ongoing. I think Karine said it really well yesterday, sadly we don't have an agreement to tell you about," national security spokesman John Kirby told reporters at the White House.

"We made a serious offer," Kirby said, referencing the Biden administration's offer for the release of the two U.S. citizens in Russian custody.

"What I can tell you for sure is the president is not going to let up," he added.

— Amanda Macias

Ukraine is consolidating gains in the north, making 'forward movements' in the south, according to latest U.S. assessment

Pentagon Press Secretary Air Force Brig. Gen. Pat Ryder speaks during a news briefing at the Pentagon September 6, 2022 in Arlington, Virginia. Brig. Gen. Ryder held a news briefing to answer questions from members of the press.
Alex Wong | Getty Images

The latest U.S. assessment of the war in Ukraine is that Ukraine is setting the pace of the war both in the north and south, but that its momentum is manifesting differently in the two different theaters.

"In the north, what we assess is that the Ukrainians are consolidating their gains after taking back significant territory, and that the Russians are attempting to shore up their defensive lines after having been pushed back," said Pentagon press secretary Air Force Brig. Gen. Pat Ryder in a briefing with reporters.

"In the south, the Ukrainians continue to make what we would assess as deliberate calculated forward movements, as the Russians continue to try to hold that line," he added.

Ryder declined to speculate on any timeline for an end to the conflict. "The only thing that could shorten it is if the Russians decided to do the right thing and withdraw their forces from occupying Ukraine," he said.

-- Christina Wilkie

About 16 million people in Ukraine are in need of water, sanitation and hygiene assistance

Maria Pshenychnykh, 83, sits in the kitchen of her war-damaged home near Kharkiv on May 18, 2022 in Vilkhivka, Ukraine, which had until recently been occupied by Russian forces. Seniors in the city have been relying on humanitarian aid, as their monthly government pension payments were suspended due to the fighting. In recent weeks Ukrainian forces have advanced towards the Russian border after Russia's offensive on Kharkiv, Ukraine's second largest city stalled.
John Moore | Getty Images

About 16 million people in Ukraine urgently need water, sanitation and hygiene assistance, the United Nations estimates.

"These include internally displaced people in collective centers and host communities, in addition to communities affected by hostilities-related damages to systems and limitations in water treatment consumables," the U.N. wrote.

The U.N. warned that there is an elevated risk of sanitation and hygiene-related diseases.

The Kremlin has previously denied that its forces target civilian infrastructure.

— Amanda Macias

U.S. delegation will meet with Ukrainians at U.N. General Assembly next week, no plans to meet with Russians

New US Ambassador to the United Nations, Linda Thomas-Greenfield speaks after meeting with UN Secretary-General Antonio Guterres at the United Nations on February 25, 2021 in New York City.
Angela Weiss | AFP | Getty Images

U.S. Ambassador to the United Nations Linda Thomas-Greenfield said the Biden administration will meet with Ukrainian officials on the sidelines of the United Nations General Assembly next week.

The high-level meeting of the 193 members of the United Nations General Assembly begins on Sept. 20 in New York City.

Thomas-Greenfield declined to elaborate further on the meetings President Joe Biden and Secretary of State Antony Blinken would have.

She said the Biden administration does not now have plans to meet with the Russian delegation at the United Nations.

"They have not indicated that they have an interest in diplomacy. What they're interested in is continuing to raise this unprovoked war on Ukraine," she told reporters during a press briefing at the United Nations.

— Amanda Macias

More than 14.5 million people in Ukraine are in need of health assistance, U.N. says

A medical worker takes care a patient who was injured during a Russian cruise missiles strike on Thursday at a hospital in Vinnytsia, Ukraine July 15, 2022.
Maxym Marusenko | Nurphoto | Getty Images

More than 14.5 million people in Ukraine are in need of health assistance, according to a United Nations estimate.

"Access to health care continues to be severely impacted by security concerns, restricted mobility, broken supply chains and mass displacement," the U.N. wrote in a new report.

Since Russia invaded Ukraine on Feb. 24, there have been at least 550 attacks on vital health services in the country, the World Health Organization's Surveillance System for Attacks on Health Care estimates.

The organization reports that health care facilities were damaged 469 times, ambulances were targeted in 75 cases and at least 144 attacks affected crucial medical supplies. The group also estimated that attacks on health services led to at least 100 deaths and 129 injuries.

The Kremlin has previously denied that it targets civilian infrastructure like hospitals, schools and apartment buildings.

— Amanda Macias

U.S. ambassador to the U.N. slams Russia's weaponization of food

Linda Thomas-Greenfield, United States Ambassador to the United Nations, addresses the United Nations General Assembly during a special session at the United Nations headquarters on March 23, 2022 in New York City.
Michael M. Santiago | Getty Images

U.S. Ambassador to the United Nations Linda Thomas-Greenfield slammed Russia's war in Ukraine and Moscow's decision to weaponize food supply.

"Before the war, Russia and Ukraine accounted for almost a quarter of global grain exports. But now Ukraine's once rolling wheat fields have become battlefields. This weaponization of food has had global ripple effects. Russia's war has exacerbated this crisis," Thomas-Greenfield said at the United Nations.

"The impacts on wheat, food, oil, and fuel are being felt by all of us. The answer to all of the questions is simple – end the war – end the unprovoked attack on Ukraine and that will get us out of part of this situation," she added.

Thomas-Greenfield said that Ethiopia, northeast Nigeria, Yemen and South Sudan are proving to be the most vulnerable countries to food insecurity.

— Amanda Macias

Four vessels set to depart Ukraine carrying 69,600 metric tons of agricultural products

An aerial view of "Glory" named empty grain ship as Representatives of Russia, Ukraine, Turkey and the United Nations (UN) of the Joint Coordination Center (JCC) conduct inspection on vessel in Istanbul, Turkiye on August 09, 2022.
Ali Atmaca | Anadolu Agency | Getty Images

The organization overseeing the export of agricultural products from Ukraine said it has approved four vessels to leave the besieged country.

The Joint Coordination Center, an initiative of Ukraine, Russia, the United Nations and Turkey, said that the vessels are carrying 69,600 metric tons of grain and other food products.

The ships are expected to depart tomorrow and are destined for Germany, Romania, Greece and Egypt.

Since Ukraine's ports were reopened, more than 2.2 million metric tons of grain and other food products have been exported.

— Amanda Macias

More than 400 bodies found in mass graves in Izium, Zelenskyy says

This photograph taken eastern Ukraine on September 16, 2022 shows crosses at a burial site in a forest on the outskirts of Izyum.
Juan Barreto | AFP | Getty Images

EDITORS NOTE: This post shows graphic content of mass graves uncovered near Izyum, Ukraine.

Ukrainian President Volodymyr Zelenskyy said that more than 400 bodies have been discovered in mass grave sites in the city of Izium.

Two forensic technicians dig near a cross in a forest on the outskirts of Izyum, eastern Ukraine on September 16, 2022.
Juan Barreto | AFP | Getty Images

"More than 400 bodies were found at the mass burial site in Izyum with signs of torture. Children, those killed as a result of missile attacks, warriors of the Armed Forces of Ukraine," Zelenskyy said in English on the Telegram messaging app.

"Russia leaves only death and suffering. Murderers. Torturers. Deprived of everything human. You won't run away. You won't hide. Retribution will be justly dreadful. For every Ukrainian, for every tortured soul," he added.

Forensic technicians dig a grave in a forest on the outskirts of Izyum, eastern Ukraine on September 16, 2022. - Ukraine said on September 16, 2022 it had counted 450 graves at just one burial site near Izyum after recapturing the eastern city from the Russians. 
Sergey Bobok | AFP | Getty Images
EDITORS NOTE: Graphic content / Forensic technicians carry a body bag in a forest on the outskirts of Izyum, eastern Ukraine on September 16, 2022. 
Sergey Bobok | AFP | Getty Images
Forensic technicians uncover a coffin in a forest on the outskirts of Izyum, eastern Ukraine on September 16, 2022. - Ukraine said on September 16, 2022 it had counted 450 graves at just one burial site near Izyum after recapturing the eastern city from the Russians.
Sergey Bobok | AFP | Getty Images

The Kremlin has previously denied that its forces target and kill civilians, which is a violation of international humanitarian law.

— Amanda Macias, Adam Jeffery and Getty Images

Ukraine war has pushed 70 million people closer to starvation, UN says

KHMELNYTSKYI, UKRAINE - AUGUST 05: A combine harvesters of Astarta-Kyiv agri-industrial holding harvests wheat on August 5, 2022 in the Khmelnytskyi region of Ukraine. In normal times, Ukraine is one of the world's largest grain exporters, but the Russian invasion and naval blockade has trapped millions of metric tons of grains here, raising fears of a global food crisis. On Monday, a ship full of corn was the first such vessel to leave Ukraine's southern port of Odessa following a deal brokered by Turkey and the United Nations, to ensure the safe passage of grain to foreign ports. (Photo by Alexey Furman/Getty Images)
Alexey Furman | Getty Images News | Getty Images

Russia's invasion of Ukraine and the ensuing nearly seven months of war have thrown millions of people around the world into food insecurity and brought many of those closer to starvation, the head of the U.N.'s World Food Program warned.

"What was a wave of hunger is now a tsunami of hunger," WFP chief David Beasley said, noting that the number of people suffering from acute food insecurity had doubled since the Covid-19 pandemic first hit. The war in Ukraine has sent food inflation soaring, as Russian warships have largely blocked Ukraine's vital Black Sea ports, through which huge proportions of the world's grain and other staple food products are shipped.

Beasley said that the surge in costs of food, fuel and fertilizer has brought 70 million people closer to starvation.

Turkey in July brokered an agreement that enabled Ukrainian grain to be exported from three Black Sea ports that had been blocked by Russia, and efforts are continuing to get more produce out to markets, as well as Russian fertilizer, the export of which is hampered by Western sanctions.

Still, Beasley said, "there is a real and dangerous risk of multiple famines this year."

— Natasha Turak

Milley and national security advisor Jake Sullivan hold calls with Ukrainian counterparts

US General Mark Milley attends a meeting with members of a Ukraine Security Consultative Group at the US Air Base in Ramstein, western Germany, on April 26, 2022.
Andre Pain | AFP | Getty Images

Chairman of the Joint Chiefs of Staff Gen. Mark Milley and national security advisor Jake Sullivan spoke with their Ukrainian counterparts.

"They discussed the unprovoked and ongoing Russian aggression in Ukraine and international support for the Ukrainian armed forces," according to a Pentagon readout of the call with Ukrainian Armed Forces Gen. Valery Zaluzhny and Ukraine's Andriy Yermak.

The call comes as Ukrainian forces carried out lightning advances in the country's east and south and as the Biden administration readied a new security assistance package.

The latest package, the 21st such installment, is worth approximately $600 million.

— Amanda Macias

Kyiv criticizes Germany for failing to send the heavy weapons it promised

A new Leopard 2 A7V heavy battle tank, the most advanced version of the German-made tank.
Sean Gallup | Getty Images News | Getty Images

Ukraine's relations with Germany have soured this week, with Kyiv asking why Berlin reneged on its promise to provide heavy weaponry.

Tensions over Germany's provision of Leopard tanks and infantry fighting vehicles to Ukraine — or lack thereof — came to a head this week when Ukraine's Foreign Minister Dmytro Kuleba publicly asked why Berlin was backtracking on a pledge made to send these weapons to Ukraine.

"Disappointing signals from Germany while Ukraine needs Leopards and Marders now — to liberate people and save them from genocide," Kuleba said on Twitter, adding that there was "not a single rational argument on why these weapons can not be supplied, only abstract fears and excuses."

"What is Berlin afraid of that Kyiv is no