Russia has urged Ukrainian opposition leaders to end their campaign of "ultimatums and threats" and to step up negotiations with the government.
Russia's foreign ministry said Moscow was concerned by activists' attempts to "inflame" the situation.
Protesters in Kiev have repeated their calls for the resignation of President Viktor Yanukovych, who is now back at work after four days of illness.
The EU and US are considering a big loan to help debt-laden Ukraine.
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