South Korea expects more provocative acts by North Korea in mid-October

The White House said first lady Melania Trump will accompany the president on the trip, which is to include his attendance at the Asia-Pacific Economic Cooperation summit in Vietnam and the Association of Southeast Asian Nations summit in the Philippines.

Tensions continue to increase as North Korea's leader Kim Jong-un and US President Donald Trump exchange insults and threats over the North's nuclear and ballistic missile programmes.

Trump's Asia visit also will show his "continued commitment to the alliances and partnerships of the USA in the region... and emphasize the importance of fair and reciprocal economic ties with America's trade partners", the White House said.

The president might find it hard to pressure the region to make concessions on trade terms that are favorable to the USA while he is also urging it to unite against North Korean leader Kim Jong Un, whom he calls "Rocket Man".

Trump also plans to discuss trade during his trip and will "emphasize the importance of fair and reciprocal economic ties with America's trade partners".

Joined by his wife Melania, Trump will travel November 3-14.

But then, many senior officials such as secretaries of state, defence and commerce visited the region and moreover, the announcement of the Trump's visit gives birth to the new hopes.

Additional "strategic" military assets will be sent by the United States to South Korea on a rotating basis in an effort to deter North Korea, according to Chung Eui-young, the South's national security adviser.

Hagerty also said the US government has increased pressure on North Korea "very systematically", and expressed hope that economic sanctions will curb the country's nuclear and ballistic missile ambitions.

The North's sixth and largest nuclear test was conducted on 3 September and has launched various missiles in 2017, as it accelerates its programme, aimed at enabling it to target the USA with a nuclear-tipped missile. Trump has applied heavy pressure on China to rein in North Korea.

Trump's visit to China is in response to President Xi Jinping's USA visit in April this year. "I want to thank President Xi", Mr Trump said at a news conference with Spanish Prime Minister Mariano Rajoy. Chinese top diplomat State councilor Yang Jiechi has described Trump's visit as of great importance to the bilateral relationship.

At the same time, Trump's national security team is conducting a broad review of USA strategy toward China in search of ways to counter Chinese trade practices and open up market access, a senior administration official said. "And we will stand up against reckless provocations with strong punishment", he said.

North Korea has often marked significant events on its calendar by conducting weapons tests, such as its fifth nuclear test previous year on September 9, its founding anniversary.