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Prime Minister Arseny Yatseniuk says Russian troops are now on Ukrainian soil.

The Ukrainian leader is warning that the situation in the east of the country is deteriorating rapidly.

SOUNDBITE:Ukrainian Prime Minister Arseny Yatseniuk saying:

"Russia has sent a number of armoured personnel vehicles, tanks and troops. We can confirm that Russian military boots are on Ukrainian ground. Ukrainian forces are capable to tackle and cope with Russian-led guerrillas. But this is quite difficult for us to fight with Russia and its army."

This column of armored vehichles was spotted near the Russian side of the border. While it isn't clear where they had come from or where they were headed, Kiev says

the latest reports suggest troops are working with separatists to stage an offensive in smaller cities east Donetsk where fighting has been raging since April. Much of the city has become a war zone.

The latest developments