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Russian President Vladimir Putin said Russia successfully tested the nuclear-powered Poseidon underwater drone, calling it unmatched in speed and depth and impossible to intercept. He gave no launch details, saying it "traveled for a certain amount of time." The claim followed his weekend announcement that the nuclear-capable Burevestnik missile had been tested and was being readied for deployment. He added Sarmat would soon enter combat duty, though satellite images indicate a failed silo launch. The statements came as a planned Putin-Trump summit collapsed; Trump called the testing "inappropriate" and urged peace talks.

Prepared by Lauren Mitchell and reviewed by editorial team.