Locklear added that he would “not recommend” intercepting any missile launched by North Korea irrespective of its trajectory.

South Korean officials have said that North Korea might be planning to conduct a missile test launch as early as Wednesday.

On Tuesday, Japan said it has deployed missile defense systems around Tokyo anticipating a possible North Korean missile test.

Locklear’s testimony came amid a warning Tuesday from Pyongyang advising all foreigners to evacuate South Korea because the two nations are on the brink of a nuclear war.

White House spokesman Jay Carney called the warning “more unhelpful rhetoric that serves only to escalate tensions” on the Korean peninsula, while US State Department spokesman Patrick Ventrell said comments from Pyongyang have not prompted the agency to issue a travel warning for South Korea.

Pyongyang's latest announcement comes after months of mounting tension, culminating in North Korea’s threat last week to attack South Korea and the United States.

US Secretary of Defense Chuck Hagel last week ordered missile defense systems deployed to the western Pacific island of Guam, a US territory, following a pledge by North Korea to restart operations at its Yongbyon nuclear complex, including a uranium enrichment plant and a reactor.

Locklear said in his Senate testimony Tuesday that tensions on the peninsula had reached a level unseen since the immediate aftermath of the Korean War in 1950.

“The continued advancement of the North's nuclear and missile programs, its conventional force posture, and its willingness to resort to asymmetric actions as a tool of coercive diplomacy creates an environment marked by the potential for miscalculation that, and controlled escalation, could result from another North Korean provocative action,” Locklear said.