South Korea is considering boosting its three-axis defense program by building its own nuclear-powered submarines and acquiring spy satellites to counter the North Korea threat.<br/><br/>At their second bilateral meeting on Thursday, US President Donald Trump and South Korean President Moon Jae-in committed to strengthen their combined defense posture against the People's Democratic Republic of Korea (DPRK) through Seoul's acquisition and development of highly-advanced military assets, as well as through the deployment of US strategic assets in and around South Korea.<br/><br/>Following the meeting, Trump said it was a great privilege to talk to Moon and that the ongoing North Korean crisis was the most important issue he and his counterpart had to address.<br/><br/>During his presidential campaign, President Moon said that South Korea needed nuclear-powered submarines in this era, pledging to make efforts to revise a nuclear cooperation deal with the US.<br/>