Russia announces war games; UK worried by 'extremely aggressive' probing of air space

Russia's President Vladimir Putin addresses the media during a news conference at the Presidential Palace in Ankara December 1, 2014. REUTERS/Umit Bektas

MOSCOW (Reuters) - Russia accused NATO on Monday of destabilising northern Europe and the Baltics by carrying out drills there and announced new military exercises of its own, increasing tension over the Ukraine crisis.

NATO responded by blaming Moscow for instability in the region, while British Foreign Secretary Philip Hammond said he was concerned by "extremely aggressive" probing of Britain's air space by Russian planes.