The U.S. will send nuclear-armed submarines to South Korea for the first time in more than 40 years, senior Biden administration officials told NBC News. Itâs one element of the âWashington Declaration,â an agreement Presidents Joe Biden and Yoon Suk Yeol are expected to sign Wednesday, aimed at protecting South Korea from North Korea amid growing concerns of nuclear threats. Both U.S. and South Korean leaders have taken note of Kim Jong Unâs regime testing ballistic missiles at a higher frequency over the last several months, prompting the U.S. to make âmore visibleâ deterrence efforts, the officials told NBC. The agreement will not put any nuclear weapons in South Koreaâs control. Instead, the United States will more frequently deploy military assets like submarines, bombers and aircraft carriers to the peninsula on a temporary basis. But polling shows that much of the South Korean public would prefer the country develop nuclear weapons of their own, a move the U.S. opposes.