New Delhi, Jan. 3 -- President Donald Trump invited Japanese Prime Minister Sanae Takaichi during a phone call Friday to visit the United States this year, the Japanese foreign ministry said, in what would be the ultraconservative leader's first trip to the U.S. since taking office in October.

The White House is yet to confirm the call and the invitation. It comes as ties between Japan and China have been strained, ramping up tensions in the region. The U.S., a close ally of Japan, is seeking to strengthen its ties with Tokyo but also stabilize its relationship with Beijing ahead of a likely trip by Trump to China in April.

Beijing staged two-day military exercises in the waters off Taiwan this week. Takaichi, Japan's first female prime...