* Russia tests Burevestnik * Missile was nuclear powered * Missile flew for 14,000 km, 15 hours * Putin says it can pierce any missile defences (Recasts, adds details, changes media keyword to UKRAINE-CRISIS/RUSSIA-MISSILES from UKRAINE-CRISIS/RUSSIA) By Guy Faulconbridge and Lidia Kelly MOSCOW, Oct 26 (Reuters) – Russia has successfully tested its nuclear-powered Burevestnik cruise missile, a nuclear-capable weapon Moscow says can evade any defence system, and will move towards deploying the weapon, President Vladimir Putin said on Sunday. Russia's top general, Valery Gerasimov, chief of the general staff of Russia's armed forces, told Putin that the missile travelled 14,000 km (8,700 miles) and was in the air for about 15 hours when it was tested on October 21. Russia says the 9M730 Bure

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