<span style="color: #222222;">US president Donald Trump embarked on a four-day visit to Japan amid trade war with China and renewed challenges from North Korea. <br />'' <br />'' US President will be first state guest of Japan after the enthronement of its new emperor Naruhito early this month.<br />'' <br />'' During his meeting with Prime Minister Shinzo Abe, Trump will likely to discuss trade and military during his visit. <br />'' <br />'' Meanwhile, security in Tokyo has been tightened ahead of the US president's visit. Japanese police are mobilizing about 25,000 officers to provide security for the US President. <br />'' <br />''<br />''The relations between the US and two East Asian countries – China and North Korea – are going through a tumultuous period. The visit comes as Beijing and Washington are engaged in a trade standoff.</span><br />