NATO says Russian warnings against allies 'unacceptable'

By Robin Emmott BRUSSELS (Reuters) - President Vladimir Putin's warnings to NATO allies are "unacceptable" and do not help efforts to calm tensions, the alliance said on Friday, a day after the Russian leader announced an array of new nuclear weapons. Already angry at NATO's expansion eastwards into its old Soviet sphere of influence, Putin said in a speech on Thursday that any attack on Moscow's allies would be regarded as an attack on Russia itself and draw an immediate response. While it was unclear which ally Putin had in mind, the U.S.-led NATO said the speech, one of the Russian leader's most bellicose in years, did not help calm tensions that have surged since Russia seized Ukraine's Crimea four years ago.

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