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Earlier in the day, the Ukrainian military claimed Russia had boosted its troops in the disputed area of eastern Ukraine and that attacks by separatists had intensified, Reuters reported.

"What is the purpose of this escalation? We should ask the Russians about that," Poroshenko said.

To date, more than 4,000 people have been killed in the conflict, which began at the start of 2014 when the Russia-backed Ukrainian government of then President Viktor Yanukovych was overthrown. Since then, the country has been rocked by disputes over the governance of regions including Crimea and parts of eastern Ukraine, and the country has moved away from its historic alliance with Russia into closer ties with Europe.

However, earlier on Wednesday, Arkady Dvorkovich, Russia's deputy Prime Minister, said the conflict over Ukraine's borders with Russia could be Read Moreclose to a "turning point."

"Russia is interested in stabilizing the situation globally and in Ukraine in particular," Dvorkovich told CNBC at Davos, where he is one of Russia's most senior representatives.

Poroshenko added that the Minsk agreement signed by Kiev and pro-Russian separatists in September provided a "solid platform" for peace, but that, to date, Russia had met "none of these conditions."

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Ukraine President: This is terrorism