Russia has successfully tested a nuclear-capable, nuclear-powered underwater drone, President Vladimir Putin said Wednesday, defying US President Donald Trump's warnings with Moscow's second test of a new nuclear weapons system in just a few days.

Putin on Sunday oversaw a test of another advanced nuclear-capable weapon -- the Burevestnik cruise missile, which he said had an "unlimited range". Trump called that exercise not "appropriate".

"Yesterday, another test was conducted for another prospective system -- the unmanned underwater device 'Poseidon,' also equipped with a nuclear power unit," Putin said in televised remarks while visiting a military hospital treating Russian soldiers wounded in Ukraine.

The Russian leader said there was "no way to intercept" the drone torpedo, which, a

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