US Secretary of State John Kerry has begun bilateral talks with the EU's high representative for foreign affairs, Baroness Ashton, about the situation in Ukraine.
Later this morning the pair will join the Russian and Ukrainian foreign ministers for a further round of talks on resolving the crisis.
Tensions remain high in eastern Ukraine after at least three died in a day of shooting during what was supposed to be an Easter truce.
In an exclusive interview with NBC News, the Ukrainian Prime Minister warns of the dangers of unchecked Russian expansion and aggression.
Russia, the US and the EU say that all sides have agreed to steps to "de-escalate" the crisis in Ukraine at talks in Geneva.