North Korea said Kim Jong Un supervised tests of "super-large" multiple rocket launchers designed to target Seoul. Photos showed rockets fired simultaneously from launch vehicles targeting a small island. Experts say the systems blur lines between artillery and ballistic missiles, and North Korea described some systems as capable of tactical nuclear warheads. Kim called the system's key to destroying Seoul and impressing enemies disastrous consequences. There are concerns North Korea will increase pressure during the US and South Korean election years.