SEOUL (Reuters) -North Korea is developing artificial intelligence (AI) and machine learning for everything from how to respond to COVID-19 and safeguard nuclear reactors to wargaming simulations and government surveillance, according to a new study. International sanctions imposed over its nuclear weapons program may have hindered North Korea's attempts to secure AI hardware, but it appears to be pursuing the latest technology, wrote study author Hyuk Kim of the James Martin Center for Nonproli