Poland's Foreign Minister Radoslaw Sikorski has called Russia's actions in eastern Ukraine an "aggression" that has created the most serious security crisis in Europe in decades.
"This for sure is an aggression," Sikorski told state radio. "Poland's position will be worked out in the next couple of hours."
He said the need for "strong words" had passed and called for "actions of the whole international community".
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.