Signs have been detected that North Korea's military is preparing for winter drills that will begin in December, according to the Joint Chiefs of Staff.
While months-long winter drills are routine for the North, authorities in the South said they were on high alert for any possible changes.
"Currently, the North Korean troops are conducting ordinary field exercises".
Asked if he could see himself being friends with Kim, Trump said: "That might be a odd thing to happen but it's a possibility".
South Korea and the United States were also conducting joint military drills in the East Sea utilizing three US aircraft carriers.
He also said the U.S.is maintaining "a surprise strike posture with frequent flight of B-1B and B-2 formations to the airspace of South Korea".
President Trump said Saturday that he would never call North Korean leader Kim Jong Un "short and fat", after Kim's government slammed Trump as an "old lunatic" following a recent speech in neighboring South Korea.
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US President Donald Trump has praised Vietnamese growth and plugged US business at a press conference with Vietnamese President Tran Dai Quang on a state visit to Hanoi. And do not try us.
The former top commander wrote: "The 28,500 US Armed Forces personnel in South Korea are vastly outnumbered by North Korean forces, as well as [South Korean] forces that will conduct the overwhelming majority of the fighting". "The problem is that South Korea is blindly following the US which is intent on the scheme for a nuclear war".
President Trump is now in the Philippines for the ASEAN Summit, the last leg of his Asia tour.
Trump's tweet was part of a series of tweets that included China's plan of "upping the sanctions" against North Korea and how Chinese President Xi Jinping wants to "denuclearize" the country.
Tensions between North Korea and the U.S. have escalated in recent months following the rogue state's sixth nuclear bomb test on September 3, which earned more sanctions and condemnations from the UN.
South Korean soldiers ride on an armored vehicle during a South Korea/United States combined training exercise at the U.S. Army's Rodriguez shooting range in Pocheon, northeast of Seoul, Sep.