North Korea stages massive artillery drill. US nuclear sub docks in South

Tensions around Korea shot up further Tuesday when the North began a large-scale, long-range artillery fire drill in Wonsan on the east coast, and the USS Michigan nuclear submarine docked in South Korea. Kim Jon-un is said to be supervising the drill which marks another anniversary, the founding of the North Korean army. The submarine will join the USS Carl Vinson aircraft carrier strike group which is heading for Korean waters. US, Japanese and South Korean are meeting in Tokyo, a day before the entire US Senate is received at the White House for briefings by top security officials on the North Korean crisis.