North Korea has condemned President Donald Trump's harsh rhetoric against their leader Kim Jong-un during a joint press conference with Japanese Prime Minister Shinzō Abe on Sunday.
Trump's trip comes amid escalating tensions with North Korea, which has continued to pursue its missile and nuclear programs and ramped up its missile testing.
During election campaigning, Trump said South Korea and Japan must make more contributions for together hosting 80,000 US troops or he might withdraw those soldiers.
Recent drills over South Korea by two United States strategic bombers have further raised tensions. "We know they have missiles capable of firing 4,000 to 6,000 miles, probably with a payload of half a ton, so half a ton of VX in those missiles could kill tens of thousands of people, and they could do that now, so that is a genuine concern".
This undated picture released by North Korea's Korean Central News Agency (KCNA) via KNS on March 7, 2017 shows the launch of four ballistic missiles by the Korean People's Army (KPA) during a military drill at an undisclosed location in North Korea. "It was not pleasant for them, was it?" roared Trump.
Trump was due to arrive early Tuesday in Seoul - where the subject of how to tackle North Korea's totalitarian dictator is expected to be at the top of the agenda.
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Each general counsel also struggled to name an executive at their company who is specifically tasked with overseeing the threat. This is an issue that we talk about constantly", Sean Edgett, Twitter's acting general counsel, said at the hearing.
A key US ally, South Korea is home to more than 50 million people.
US President Donald Trump said Sunday he expected to meet his Russian counterpart Vladimir Putin during an Asian tour likely to be dominated by worldwide tensions over North Korea. The White House later described the notion that the USA had declared war "absurd".
When playing out hypothetical war scenarios in case armed conflict were to break out, the Pentagon "estimated the potential number of dead in South Korea at 20,000 each day", retired general Rob Givens told the Los Angeles Times.
North Korea has said in public statements that it wants an official end to the Korean War.
Meanwhile, South Korea has also begun tightening its measures against the Pyongyang by implementing sanctions against 18 North Koreans.
And a high-profile defector last week said that North Korean military officers have been trained to trigger a devastating counterstrike if their country were attacked by the United States. Those sanctioned were banned from having any trade deals with South Korea.