The number of people killed in eastern Ukraine since last April has now topped 6,000, despite successive ceasefires, a UN spokesman said Monday.
Before he was ousted as Ukraine's president, Viktor Yanukovich drew up plans to use thousands of troops to crush the protests that eventually toppled him.
White House said the United States is ready to provide financial support to Ukraine to improve the East European country's economy.
Ukraine hopes the price it pays for Russian gas will not change, Acting Ukrainian Energy Minister Eduard Stavytsky said on Monday.
Ukraine's political scene has been in turmoil since last week, when riot police tried to clear Independence Square in Kiev of anti-government protesters. This resulted in multiple deaths. Although President Viktor Yanukovych agreed a compromise deal with the opposition leaders following the bloody clashes, the situation changed dramatically when dozens of MPs quit the ruling Party of Regions.
Ousted Ukrainian President Viktor Yanukovich is wanted by police for mass crimes against protesters, the acting interior minister said on Monday.
International community has called on all sides in Ukraine to preserve the country's unity and avoid violence after President Viktor Yanukovych was dismissed by parliament.
There has been upheaval in Ukraine since President Viktor Yanukovych's government shelved plans to sign a pact with the European Union sparking confrontation between protesters and police that resulted in death and injury.
Ukraine's interim leadership pledged to put the country back on course for European integration now that Viktor Yanukovich had been ousted.
The European Commission said on Sunday it was ready to conclude a trade deal with Ukraine once a new government was formed, and that it believed such a deal was in both parties' interests and would be signed.
A feeling of political uncertainty still haunted Ukrainians, although the country's lawmakers ousted President Yanukovych.
The West has won the first round in the fight with Russia over Ukraine, but Moscow still has cards to play and Kiev's new government will have to seek balance among the powers, observers said.
In a stunning reversal of fortune, Ukrainian opposition icon Yulia Tymoshenko left imprisonment Saturday and spoke to a massive, adoring crowd, while her arch-foe President Viktor Yanukovych decamped to eastern Ukraine and vowed he would remain in power.