05/07/2017 06:36 BST | Updated 05/07/2017 06:36 BST

Officials Confirm North Korea Launched ICBM, Say U.S. ‘Prepared To Defend Ourselves’

The United States and South Korea on Tuesday fired back at North Korea's military provocations, launching "deep strike" missiles into South Korean waters during a show of force as U.S. Secretary of State Rex Tillerson called the situation a "new escalation of the threat" from the reclusive nation.

Following Monday's launch of what has been confirmed to be the North's first successful intercontinental ballistic missile (ICBM), the Pentagon warned the country and its leader, Kim Jong Un, that the U.S. was "prepared to defend ourselves and our allies and to use the full range of capabilities at our disposal against the growing threat from North Korea."

"The United States seeks only the peaceful denuclearization of the Korean Peninsula," chief Pentagon spokesperson Dana White said in a statement. "Our commitment to the defense of our allies, the Republic of Korea and Japan, in the face of these threats, remains ironclad."

Tillerson added: "As we, along with others, have made clear, we will never accept a nuclear-armed North Korea."

KCNA / Reuters
The intercontinental ballistic missile fired Monday, the Hwasong-14, seen during its test launch in this undated photo released by North Korea's Korean Central News Agency.

The U.S. has also requested an emergency meeting of the United Nations Security Council, which is expected to take place on Wednesday.

The North's missile launch, its 11th this year, is the latest in a string of tests as it continues its aim to develop an intercontinental ballistic missile capable of reaching the United States. Monday's launch represents a significant milestone in that venture, and experts say the rocket's trajectory and 37 minute flight time could allow such a weapon to hit the state of Alaska.

North Korean state media claimed the new missile was capable of carrying a large nuclear weapon, but The New York Times notes experts still doubt the country can make warheads small enough to fit onto an ICBM.

The North often conducts major military exercises around important international and American events, and has in the past fired weapons around the American July 4 holiday. But the move is sure to increase pressure on the administration of U.S. President Donald Trump and any plans to rein in the hermit nation.

Kim used the launch to taunt the United States during its Independence Day holiday, calling the missile a "gift" to Americans.

"We should send them gifts once in a while to help break their boredom," he said, according to the country's state-run news agency.

Trump has sought to work with China to quash North Korea's nuclear program. Trump has reportedly grown frustrated with Chinese President Xi Jinping's unwillingness to increase pressure on the North. The New York Times has reported Trump has said he's prepared to act unilaterally on the issue.

The president spoke by phone with Xi and Japanese Prime Minister Shinzo Abe over the weekend to discuss North Korea, and the White House said "both leaders reaffirmed their commitment to a denuclearized Korean Peninsula."

Trump addressed the launch on Twitter late Monday night, rhetorically asking if North Korean leader Kim Jong-un had "anything better to do with his life." He also suggested that China should increase pressure on the North.