Three U.S. aircraft carriers, accompanied by South Korean warships, launched a joint naval drill Saturday in a fresh show of force aimed at North Korea, whose nuclear ambitions have dominated U.S. President Donald Trump's ongoing tour of Asia.
The four-day exercise in the western Pacific involves three U.S. Navy flattops -- the Ronald Reagan (CVN 76), Nimitz (CVN 68) and Theodore Roosevelt (CVN 71) -- and seven South Korean warships. It is the first such triple-carrier drill in the region for a decade.
"The exercise is aimed at enhancing deterrence against North Korea's nuclear and missile threats and showing off preparedness to fend off any provocative acts by the North," a South Korean defense ministry spokesman said.
Nuclear-armed North Korea regularly denounces such military drills as rehearsals for invasion and sometimes conducts its own military maneuvers or missile tests in response.
The U.S. warships will carry out air defense drills, sea surveillance, defensive air combat training and other operations, the U.S. Navy said.
The exercises come on the heels of Trump's visits to Tokyo, Seoul and Beijing this week, which were dominated by the question of how to counter Pyongyang's nuclear weapons threat.
At a summit in Seoul, Trump and South Korean President Moon Jae-In agreed to increase the deployment of U.S. military assets around the Korean peninsula to step up pressure on the North.
And in a speech to the South Korean parliament, Trump warned North Korea not to underestimate the United States, while offering leader Kim Jong-Un a better future if he gives up his nuclear ambitions.
The North, which this year carried out its sixth nuclear test, generating by far the largest yield to date, has fired dozens of missiles in recent months -- all in defiance of multiple U.N. sanctions.
Two missiles have overflown key U.S. ally Japan, and the regime has claimed that it now has the technology to mount a nuclear warhead on a missile that can travel as far as the U.S. mainland.
There has been speculation that Kim would order another missile test to coincide with the U.S. president's marathon visit to the region that ends on Tuesday.
- 'Time running out' -
Since becoming president, Trump has engaged in an escalating war of words with Kim, trading personal insults and threats of military strikes and raising concerns about an outbreak of hostilities.
His remarks during his Asian tour -- including references to Kim's "twisted fantasies" -- have been tempered by calls for Pyongyang to come to the negotiating table and seek a diplomatic route out of the crisis over its nuclear arsenal. During talks in Beijing on Thursday, Trump urged Chinese leader Xi Jinping to do more to rein in the Pyongyang regime, warning that "time is quickly running out."
The U.S. administration thinks China's economic leverage over North Korea is the key to strong-arming Pyongyang into halting its nuclear weapons and missile programs.
Xi said the two countries reiterated their "firm commitment" to the denuclearization of the Korean peninsula and implementation of U.N. resolutions. Although China has backed U.N. sanctions, U.S. officials want Chinese authorities to clamp down on unauthorized trade along the North Korean border.
But experts doubt China will take the kind of steps that Trump wants, such as halting crude oil exports to the North.
Beijing fears that squeezing Pyongyang too hard could cause the regime to collapse, sending an influx of refugees across its border and placing U.S. forces on its doorstep.