The EU says it is putting on hold work on a key trade agreement with Ukraine, saying the government's arguments have "no grounds in reality". Protesters have taken to the streets in support of the agreement, which was rejected by the government.
US Senators John McCain and Christopher Murphy told journalists on Sunday that Ukraine faced "a clear choice between its past and future", voicing their support for pro-EU protesters who have been out in the streets for the third week in a row demanding a European future for their country.
Speaking to journalists after addressing crowds, both senators said Russia's interference in Ukrainian matters was not welcome, adding that it was disturbing to hear that the EU may be suspending talks with Ukraine on the trade and political agreement.
There is an urgent need for de-escalation in Ukraine as President Yanukovich tries to calm a country bitterly divided over years of history.
Ukraine's political and economic landscape is stuck between old Soviet masters in Russia and the democratising ideals offered by the EU.