The number of people killed in eastern Ukraine since last April has now topped 6,000, despite successive ceasefires, a UN spokesman said Monday.
Russian legislators have asked President Vladimir Putin to stabilize the situation in Ukraine's Crimea.
The new prime minister of Crimea calls on Russian President Vladimir Putin to help guarantee peace in the crisis-torn region in southern Ukraine.
US Vice President Joe Biden also reiterated US commitment to the sovereignty, territorial integrity and democratic future of Ukraine.
The international community has called on all parties in Ukraine's crisis to avoid military confrontation amid escalating tensions in Crimea.
Ukraine accused Russia of staging an "armed invasion" of Crimea and appealed to the West to guarantee its territorial integrity.
A Downing Street spokesperson said British Prime Minister David Cameron on Friday made a phone call to Russian President Vladimir Putin to discuss the situation in Ukraine, particularly the escalating tensions in Crimea.
A Foreign Ministry spokesman said on Friday that China believes the Ukrainian people are able to resolve their problems themselves, as protestors in Crimea call for a referendum over the future status of the Crimea Autonomous Republic in southern Ukraine.
Armed men take control of 2 airports in the Crimea region in what the new Ukrainian leadership described as an invasion by Moscow's forces.
British Foreign Secretary William Hague said on Friday he would travel to Ukraine at the weekend to hold talks with the new leadership.
The U.N. Security Council will hold a closed-door emergency session on the escalating crisis in Ukraine on Friday at the request of the new Kiev government.
US Vice President Joe Biden hailed the formation of a new Ukrainian government as an important opportunity for peace, said a statement issued by the White House Thursday.
An armed group took control of the airport of Crimea's capital Simferopol in southern Ukraine on Friday.
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