Russia has called for peace in Ukraine as it tries to push for a ceasefire.
Russia foreign minister Sergei Lavrov urged for a new round of talks on the issue and said: "We call for an exclusively peaceful settlement of this severe crisis, this tragedy."
Pro-Russian separatist leader Andrei Purgin said they were willing to discuss the exchange of prisoners and a temporary ceasefire.
Fighting in eastern Ukraine between separatists and the Ukrainian government has been going on since Russia annexed Ukraine's southern peninsula of Crimea in April.
Were the Russians -as Barack Obama claims - weighed down by sanctions, or where the Ukrainians looking to cut their losses?
The new president of the European Council could be "very important" for David Cameron.