Russia has recalled its ambassador to Ukraine over what it described as the deteriorating situation in the country.
Moscow has condemned the removal of President Viktor Yanukovych, who was dismissed by lawmakers on Saturday.
Ukraine’s newly appointed interim president, Oleksandr Turchynov, says the country will now focus on closer integration with the EU.
Yanukovych’s rejection of an EU-Ukraine trade pact triggered the protests that toppled him.
US Secretary of State John Kerry has said the US strongly supports the actions by the Ukrainian parliament.
EU foreign policy chief Catherine Ashton has announced she is visiting Kiev on Monday to discuss EU support “for a lasting solution to the political crisis and measures to stabilise the economic situation”.
Russia and the US have been on opposite sides during the Ukraine crisis, with the US, along with the EU, backing the opposition.
On Sunday Kerry said the lawmakers’ vote offered “the best and most promising path forward to restore peace and stability”, according to a statement.