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Ukraine rebels gearing up for counteroffensive

Ukrainian servicemen sit next to a national flag of Ukraine on an armored personnel carrier near the eastern Ukrainian city of Slavyansk, in the region of Donetsk, on Aug. 5, 2014.
Anatolii Stepanov | AFP | Getty Images
Ukrainian servicemen sit next to a national flag of Ukraine on an armored personnel carrier near the eastern Ukrainian city of Slavyansk, in the region of Donetsk, on Aug. 5, 2014.

Ukrainian rebels are receiving new armored vehicles and fighters trained in Russia, with which they plan to launch a major counter-offensive against government forces, a separatist leader said in a video released on Saturday.

The four-month conflict in eastern Ukraine 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—an intention Moscow denies.

Alexander Zakharchenko, prime minister of the self-proclaimed Donetsk People's Republic, said the rebels were in the process of receiving some 150 armored vehicles, including 30 tanks, and 1,200 fighters who he said had spent four months training in Russia."

"They are joining at the most crucial moment,'' he said in a video recorded on Friday. He did not specify where the vehicles would come from Moscow has come under heavy Western sanctions over its annexation of Ukraine's Crimea and accusations it is supporting separatists in east Ukraine with fighters, arms and funds. Russia denies those charges.

In a sign of concern at the latest rebel comments, German Chancellor Angela Merkel and Ukrainian President Petro Poroshenko agreed in a phone call on Saturday that deliveries of weapons to separatists in Ukraine must stop and a ceasefire must be achieved, a German government spokesman said.

Read MoreWest faces tough choices if Russia, Ukraine fight

The risk of outright war between the two most powerful former Soviet states was highlighted on Friday when Ukraine said it partially destroyed an armored column that had crossed the border from Russia. The report triggered a sell-off in global shares.

But Moscow made no threat of retaliation, instead saying it was a "fantasy'' that its armored vehicles had entered its neighbor's territory.

U.S. Vice President Joe Biden also spoke to Poroshenko on Saturday, and the White House said: "The two leaders agreed that Russia's sending military columns across the border into Ukraine and its continued provision of advanced weapons to the separatists was inconsistent with any desire to improve the humanitarian situation in eastern Ukraine.''

Read MorePutin: Russia doesn't want war or confrontation

Ukrainian Foreign Minister Pavlo Klimkin called on NATO to provide military support for Ukrainian troops.

The rebels, who have ceded ground to government forces in recent weeks, have been promising a counter-offensive for several days but have yet to launch one.

Ukrainian native Zakharchenko took over from Russian citizen Alexander Borodai last week and his combative comments will probably dash hopes that changes at the top of the rebel leadership might signal willingness to end hostilities.

—Reuters

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