U.S. President Donald Trump, one of the most powerful and controversial political players in the world, is coming to Tokyo on Sunday, kicking off a 12-day trip around Asia, including South Korea and China.

Trump and Prime Minister Shinzo Abe are expected to reaffirm the usual message at their summit on Monday: The Japan-U.S. military alliance is stronger than ever, and ready to cope with any threat from North Korea's missile and nuclear weapons programs.

Japanese officials called their relationship one of the best in decades.