U.S. Vice President Mike Pence put North Korea on notice Monday, saying neither the United States nor South Korea would tolerate further missile and nuclear tests, with U.S. attacks in Syria and Afghanistan showing its resolve.

Pence and South Korean Acting President Hwang Kyo-ahn, speaking a day after a failed missile test by the North and two days after a huge display of missiles in Pyongyang, also said they would strengthen anti-North Korea defense by moving ahead with the early deployment of the Terminal High Altitude Area Defense (THAAD) anti-missile system.

Pence is on the first stop of a four-nation Asia tour intended to show America's allies, and remind its adversaries, that the administration of President Donald Trump was not turning its back on the increasingly volatile region.