The U.S. has told North Korea it won't be allowed to become a nuclear power, and America will defend both South Korea and Japan if they come under attack.
Speaking in the South Korean capital Seoul, the U.S. Secretary of State John Kerry said it would be "a huge mistake" for the North to conduct any new missile tests.
Matthew Jones is the Public Affairs manager at Christian Solidarity Worldwid.
He told Premier's News Hour there's no way of knowing what will happen next: