While the Korean peninsula is now the primary region of concern, experts believe that the isolated regime is close to its goal of developing a powerful nuclear weapon capable of reaching the United States.
"Military action would certainly be an option", Trump told a White House news conference.
"We have made a decision to temporarily deploy the remaining launchers along with United States construction equipment and materials (...) to prepare for the heightened security situation in North Korea due to North Korea's nuclear and missile threats", the South Korean Defence Ministry said in a statement.
A tactical nuclear weapon, which is created to be used against battlefield targets, generally travels across short ranges and carries a low-yield warhead.
South Korea's Yonhap news agency quoted an unidentified government official as saying that the North could carry out a seventh nuclear test at its Punggye-ri test site at any moment.
North Korea's state media marked the nation's founding anniversary Saturday (Sep 9) with calls for a nuclear arms buildup, in defiance of mounting worldwide sanctions. He said that as long as the United States, "relies on reckless provocations and futile attempts to put pressure on the DPRK", it will receive more "gift packages".
Trump has repeatedly criticized the five-year-old South Korea-U.S. (KORUS) FTA as a frightful deal for creating a $27 billion U.S. trade deficit with South Korea last year.
Beijing has objected to the advanced anti-missile battery high-resolution radar system that can potentially monitor China's military activities as a threat to its security, and had reportedly imposed informal restrictions on selected South Korean imports and tourism as retaliation.
North Korea has said in public statements that it wants an official end to the Korean War.
The main opposition Liberty Korea Party (LKP), meanwhile, said Thursday it would send a delegation to the United States next week to check whether Washington officials actually have the will to provide tactical nuclear weapons to South Korea.
US President Donald Trump has urged China to do more to rein in its neighbour, which has pursued its weapons programs in defiance of United Nations sanctions and global condemnation.
China is by far North Korea's biggest trading partner, accounting for 92 percent of two-way trade previous year.
The Moon administration faces the prospects of increased USA tariffs at the same time it is experiencing informal sanctions from China for deploying the American THAAD missile defense system.
The full deployment of the THAAD, which consists of at least six launchers, comes 14 months after Washington and Seoul in July 2016 agreed to install it on South Korean territory to counteract the North Korean threat.
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