Chinese President Xi met his USA counterpart Donald Trump after the closing ceremony of the G20 Hamburg Summit, holding talks on economic plans and the upcoming meeting between the countries' military officials.
The mistake came in a rushed transcript of Trump's remarks following the meeting with Xi who is President of the People's Republic of China, as the country is officially known. Tsai Ing-wen is the strongest woman politician in the region.
Ties between China and the US have suffered because of the American relationship with Taiwan, particularly after President Trump spoke on the phone with Taiwanese President Tsai Ing-wen in a break from protocol shortly after his election to the White House. The United States severed formal ties with Taiwan in 1979 as part of the so-called One China policy under which it recognises Beijing as the government of China. "But there will be success in the end one way or the other", Trump said.
In a gaffe in 2006, a White House announcer introduced "the national anthem of the Republic of China" as then-President George W Bush and former Chinese President Hu Jintao stood together during the latter's visit to Washington.
The issue of Taiwan is very sensitive to China because the mainland considers it as its breakaway province. And another White House statement called the prime minister of Japan, Shinzo Abe, "President Abe of Japan".
This is not the first time that Trump has blundered into the extremely sensitive question of Taiwan's sovereignty.
While Xi said after his Saturday meeting with Trump that Beijing would "like to work with the USA", he last week described the relationship as afflicted by "negative factors".
Three weeks into his presidency, Mr Trump dropped the gambit, paving the way for a phone call with Mr Xi and kicking off a relationship between the two which led to meetings at Mar-a-Lago in April and at the G-20 on Saturday (July 8).