MOSCOW (AP) — Russia has conducted a successful test of a new atomic-powered and nuclear-capable underwater drone, President Vladimir Putin said Wednesday, declaring that the new weapon can't be intercepted.

Putin's statement, which comes three days after he praised a successful test of a new nuclear-powered cruise missile , appears to be another message to U.S. President Donald Trump that Russia is standing firm in its maximalist demands on Ukraine.

Speaking at a meeting with soldiers wounded in Ukraine, Putin said the Poseidon drone was tested while running on nuclear power for the first time Tuesday, describing it as unmatched in speed and depth.

He said the nuclear reactor that powers Poseidon is “100 times smaller” than those on submarines, and the power of its nuclear warhead is

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