Answer: Russia
Notes: Russia has successfully tested its new atomic-powered and nuclear-capable underwater drone named Poseidon. President Vladimir Putin announced the test, calling it a major success and saying it cannot be intercepted. The test took place just days after Russia also tested the Burevestnik nuclear-powered cruise missile. Both tests are seen as signals to the United States amid the ongoing Ukraine conflict. The Poseidon drone was tested using nuclear power for the first time. It reportedly surpasses all current systems in speed and depth. Its nuclear reactor is 100 times smaller than those on submarines. The drone’s nuclear warhead is said to be more powerful than the Sarmat Intercontinental Ballistic Missile (ICBM).
