"But for this particular case, if they took the time and energy to launch a missile that failed, we don't need to expend any resources against that".
The White House adviser said Trump and China's President Xi Jinping had discussed a number of steps at their summit this month and "we've seen the Chinese already take some initial steps towards that" - citing the turning back of coal ships from North Korea.
South Korea said the North's latest show of force "threatened the whole world" but a US foreign policy adviser traveling with Pence on Air Force Two sought to defuse some of the tension, saying the test of what was believed to be a medium-range missile had come as no surprise.
At Seoul National Cemetery, I laid a wreath to honor South Koreans who sacrificed their lives for the cause of freedom.
McMaster said President Donald Trump has made clear he will not allow the nuclear-armed Pyongyang regime to put the U.S. and its regional allies under threat.
North Korea conducted a failed missile test Sunday in defiance of increased US warnings that there would be serious consequences for such provocative actions, including a possible military response.
The U.S. nuclear-powered Carl Vinson aircraft carrier strike group is also heading to the region.
The United States, South Korea and other countries have vowed to apply more pressure on the North, but so far nothing has worked to stop Pyongyang's nuclear program.
Reuters reported last week that Trump is focusing his North Korea strategy for now on tougher sanctions, possibly including an oil embargo, banning its airline, intercepting cargo ships and punishing Chinese banks doing business with Pyongyang, U.S. officials said. Apparently timed to coincide with the parade and the arrival of a U.S. Navy strike group in the region earlier in the week, the missile "blew up nearly immediately" after launch, according to U.S.
Mashrafe Mortaza calls time on his T20I career
But Soumya Sarkar (29) and Sabbir Rahman (16) led a recovery, adding 57 runs for the second wicket with more than 10 runs an over. Bangladesh lost another wicket without addition to the score when Sarkar was caught by Thisara Perera off seamer Vikum Sanjaya.
"The days where the US would negotiate with North Korea and leave the South Koreans at the airport wondering what was going on - those days are over", he said.
Tension had escalated sharply in the region amid concerns that the reclusive North may soon conduct a sixth nuclear test or a ballistic missile test launch timed with the April 15 anniversary it calls the "Day of the Sun".
South Korea said it would convene a national security council meeting on Sunday. Other White House reporters cited their own unnamed sources as saying the USA planned only to retaliate.
A White House foreign policy adviser told reporters aboard Air Force Two that the type of missile that North Korea tried to fire on Sunday was medium-range, and that it exploded about 4 to 5 seconds after it was launched. China on Friday again called for talks to defuse the crisis.
Trump turned to Twitter over the weekend to underscore the key importance of cooperation with China on the Korean problem.
During his visit to Seoul, which is about 182 miles from the launch site of the latest missile, Vice President Pence is expected to issue a warning to Kim Jong Un's regime that North Korea would face strong consequences if the country's provocative behavior was not stopped.
North Korea conducts nearly 90 percent of its trade with China, including exports of coal, iron ore and zinc, along with seafood and textiles.
Trump has repeatedly said he will prevent Pyongyang from developing a nuclear-tipped ballistic missile capable of reaching the mainland United States.
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