Russian Foreign Minister Sergei Lavrov reaffirmed the country's support for the Syrian government.
Clashes near the port city of Mariupol and the rebel-held town of Gorlivka have put further strain on a fragile ceasefire.
Russian Foreign Minister Sergey Lavrov wants the Assad government to be part of a coalition to fight ISIS.
The Iran nuke deal must not lead to dropping our guard against the Russian nuclear threat.
Washington says Moscow training pro-Russian rebels and quantity of air defence equipment in eastern Ukraine "highest since August".
British foreign secretary warns "key issues" still to be resolved as talks on preliminary framework pass deadline.
Commemoration due to be attended by 26 countries and could include first meeting of Chinese and North Korean leaders.
When he is not in talks over Ukraine, Sergei Lavrov shows a penchant for poetry.
Obama and Cameron call for stronger NATO alliance as ISIS and Ukraine dominate summit talks