Seven Nato allies are to create a new rapid reaction force of at least 10,000 soldiers to boost NATO defences in response to Russia's intervention in Ukraine, according to the Financial Times.
The British-led force would include air and naval units as well as ground troops, the newspaper said.
Other countries involved include Denmark, Latvia, Estonia, Lithuania, Norway and the Netherlands. Canada has also expressed an interest in taking part, it said.
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.