The White House said Monday that President Barack Obama “fully supports” the South Korean president and his response to the torpedo attack by North Korea that sank a South Korean naval ship.

In a statement, the White House said Seoul can continue to count on the full backing of the United States and said U.S. military commanders had been told to work with their South Korean counterparts “to ensure readiness and to deter future aggression.”

The administration said it endorsed President Lee Myung-bak’s demand that “North Korea immediately apologize and punish those responsible for the attack, and, most importantly, stop its belligerent and threatening behavior.”

The United States still has about 28,000 troops in South Korea to provide military support. The two Koreas, still technically at war, have more than 1 million troops near their border.

“U.S. support for South Korea’s defense is unequivocal, and the President has directed his military commanders to coordinate closely with their Republic of Korea counterparts to ensure readiness and to deter future aggression,” the statement said.

(Read More: MSNBC)