Trump and Takaichi spoke after the China-US leaders phone call

US President Donald Trump called Japanese Prime Minister Sanae Takaichi on Tuesday, hours after Trump's call with President Xi Jinping.

Takaichi said Trump briefed her on his conversation with Xi, but she did not elaborate further, including on any discussion regarding her comments on Taiwan.

It comes after Foreign Minister Wang Yi said Japan "crossed the red line" with comments by Takaichi suggesting a potential military intervention over Taiwan.

Beijing last week sent a letter to UN Secretary General Antonio Guterres criticising Takaichi's "grave violation of international law."