By Lili Bayer and Mark Trevelyan BRUSSELS, Sept 30 (Reuters) - Russia has warned NATO it would be ready to resort to nuclear weapons if the Western alliance attempted to cut off Kaliningrad, a Russian exclave that borders the Baltic Sea.

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The warning echoed statements by several Russian embassies in Europe this week that Moscow has "information that NATO is preparing" a blockade of Kaliningrad.

Russia has told NATO that it would use nuclear weapons if it attempted to cut off the Russian exclave of Kaliningrad. In a document sent to NATO, Russia accused the political and