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South Korean President Moon Jae-in is paying his maiden foreign visit to Washington, but his trip may be tough, given that the two nations have not been on the same page on a variety of issues since Moon came to power in early May.

The first thing that Moon should do during his visit is to build mutual trust with US President Donald Trump, who has already kept Koreans on their toes with his scathing Korea-related tweets. It is not a secret that relations between South Korea and the US have been uneasy if not tense when a progressive president occupied the Blue House.

Naturally, the US cast a wary eye on Moon as he emerged as the winner of the presidential election, since Moon had been perceived as a pro-North Korean politician.

As the short-tempered Trump struggles to build good relations with allied nations, we'll see if Moon can sail his country's relations with Washington through choppy waters in the years to come.

Moon once claimed that he wants to build personal friendship with Trump and consolidate allied relations with the US. However, he cannot skip some urgent issues that may bring the two into conflict.

On the security front, Moon and Trump have to redress their differences in dealing with North Korea. The Trump administration is now carrying out a "maximum pressure and engagement" policy with an emphasis on pressure. Moon acknowledges the necessity of exerting pressure on North Korea but highlights the value of reaching out to it for talks.

In fact, the Moon administration has already taken measures to thaw frozen relations with Pyongyang. Moon even took a step further by proposing to cohost the Winter Olympics Games with North Korea next year.

The deployment of the THAAD missile defense system is another divisive issue that has begun to bring the two nations toward a head-on collision. The decision to deploy THAAD in South Korea was jointly made by South Korea and the US, but the former has borne the major brunt of alienating China, which believes that the deployment will sabotage strategic stability in Northeast Asia. For the first time since the two nations exchanged diplomatic recognition in 1992, relations between South Korea and China suffered a deep plunge.