China's been steadily upgrading its submarine fleet and weapons to detect those of the US should the two nations go to war.

The global network of P-8 maritime patrol aircraft contributes to maritime domain awareness, the U.S. Navy said.

Beijing hopes Washington, Seoul 'will do things that promote regional peace, stability, not the opposite' - Anadolu Ajansı

China operates its nuclear submarines in the East and South China Seas, as well as the western Pacific, and with South Korea now having their possession, it has left Tokyo out of the loop

The MH-60R helicopter provides what Lockheed Martin calls "transformational" anti-submarine and anti-surface warfare capabilities. It is equipped with advanced sensors and can carry torpedoes, missiles and rockets to target enemy submarines and ships.

President Donald Trump said he wants to accelerate nuclear submarine deliveries to Australia under the AUKUS agreement during White House meeting.

President Trump said Wednesday he's allowing South Korea to build a nuclear-powered submarine in Philadelphia.