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Ukraine claims breakthrough in rebel stronghold

Anatolii Stepanov | AFP | Getty Images

Ukrainian forces have raised their national flag over a police station in the city of Luhansk that was for months under rebel control, Kiev said on Sunday, in what could be a breakthrough in Ukraine's efforts to crush pro-Moscow separatists.

Ukrainian officials said, however, the rebels were fighting a desperate rearguard action to hold on to Luhansk - which is their supply route into neighboring Russia - and that the flow of weapons and fighters from Russia had accelerated.

The foreign ministers of Ukraine, Russia, France and Germany held a meeting in Berlin on the crisis, with German Foreign Minister Frank-Walter Steinmeier saying afterwards they would report back to their leaders and possibly agree on Monday or Tuesday on how to continue talks.

Read MoreUkraine captures rebel building, jet shot down

"The aim remains to bring about a ceasefire in Ukraine and to prevent future victims," Steinmeier said.

"It was a difficult discussion but I believe and I hope that we made progress on some points," he told reporters.

Russia denies helping the rebels and accuses Kiev, backed by the West, of triggering a humanitarian crisis through indiscriminate use of force against Russian speakers in eastern Ukraine who reject the Ukrainian government's rule.

Read MoreUkraine rebels gearing up for counteroffensive

Andriy Lysenko, a Ukrainian military spokesman, said government forces fought separatists in Luhansk on Saturday and took control of the Zhovtneviy neighborhood police station.

"They raised the state flag over it," Lysenko said.

Separatist officials in Luhansk could not be reached by telephone, and a separatist spokeswoman in Donetsk, the other rebel strong-hold, said she had no information about Luhansk.

Read MoreRussian defense ministry denies any incursion into Ukraine,says no vehicles destroyed

A photograph posted on Twitter appeared to show a Ukrainian flag on the front of the police station, but it could not be independently verified.

If confirmed, the taking of the police station is significant because Luhansk has for several months been a rebel redoubt where Kiev's writ has not run. Separatists still control sections of the border linking Luhansk region to Russia.

Ukrainian President Petro Poroshenko announced another military success, saying his forces had recaptured a railway junction at Yasynuvata, north of Donetsk, which he said had "strategic significance".

Read MoreRussian aid convoy checked; NATO spots 'incursion' into Ukraine

Critical phase

The four-month-old conflict in Ukraine's Russian-speaking east has reached a critical phase, with Kiev and Western governments watching nervously to see if Russia will intervene in support of the increasingly besieged rebels.

The rebels responded with defiant rhetoric and fighting.

Ukrainian authorities said on Sunday the separatists shot down a Ukrainian warplane.

On Saturday, Alexander Zakharchenko, prime minister of the self-proclaimed Donetsk People's Republic, said rebels were in the process of receiving some 150 armored vehicles, including 30 tanks, and 1,200 fighters trained in Russia. He said they planned to launch a major counter-offensive.

"They are joining at the most crucial moment," he said in a video recorded on Friday.

The assertion that the fighters were trained in Russia is awkward for Moscow, which has repeatedly denied allegations from Kiev and its Western allies that it is providing material support to separatist fighters.

Read MoreRussian convoy rolling again toward Ukraine

"We have repeatedly said that we don't supply any equipment there," said Dmitry Peskov, spokesman for Russian President Vladimir Putin.

Convoy

The Ukraine crisis has dragged relations between Russia and the West to their lowest point since the Cold War and set off a round of trade restrictions that are hurting struggling economies in both Russia and Europe.

Adding to the tensions, Russia and Ukraine have been at loggerheads for days over a convoy of 280 Russian trucks carrying water, food and medicine.

Read MoreRed Cross to hold aid convoy talks in Kiev, Moscow

It was dispatched by Moscow bound for eastern Ukraine but has been parked up for several days in Russia near the border.

Kiev has said the convoy could be a Trojan Horse for Russia to get weapons to the rebels, a notion that Moscow has dismissed as absurd. It said the aid is desperately needed by civilians left without water and power and under constant bombardment from the Ukrainian advance.

After days of wrangling between Kiev and Moscow, there were signs of movement on Sunday.

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Sixteen trucks separated from the main convoy and drove into a Russian bus depot near a border crossing into Ukraine, a Reuters cameraman said from the scene.

The International Committee of the Red Cross said that Russian and Ukrainian officials had agreed that the cargo could be inspected but had yet to agree on security arrangements.

Rebel rout?

Ukrainian officials have painted a picture of a separatist force that is on the run and starting to panic - though rebel fighters Reuters reporters have spoken to in Donetsk say they are determined to stand firm.

Read MoreRussia banning US poultry imports on Putin's order

In the past week, three senior rebel leaders have been removed from their posts, pointing to mounting disagreement over how to turn the tide of the fighting back in their favor.

The fighting has taken a heavy human toll.

The United Nations said this month that an estimated 2,086 people, including civilians and combatants, had been killed in the conflict. That figure nearly doubled since the end of July, when Ukrainian forces stepped up their offensive.

In Donetsk, which like Luhansk is now ringed by Kiev's forces, artillery fire has struck apartment buildings, killing and wounding residents, according to Reuters reporters. Officials in Kiev deny they are firing heavy weapons at residential areas.

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