Russia's President Vladimir Putin announced Sunday a successful final test of a new nuclear-powered cruise missile, the Burevestnik, amid Moscow's ongoing Ukraine offensive and uncertainty over a new summit with US leader Donald Trump.

"The decisive tests are now complete," Putin said in a video released by the Kremlin during a meeting with military officials.

He ordered the preparation of "infrastructure to put this weapon into service in the Russian armed forces."

Putin called the missile a "unique creation that no one else in the world possesses", adding that the Burevestnik has "unlimited range".

During the last test on October 21, the missile flew for some 15 hours, travelling 14,000 kilometres (8,700 miles), said Russia's military chief of staff Valery Gerasimov, adding that this

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