For Beijing, the island is the biggest issue in China-US relations and has the potential to lead to conflict.

Xi Jinping cautions Trump that the Taiwan issue poses a risk of conflict between the U.S. and China during their summit.

The stark contrast in tone underscored just how far apart the leaders remain on the war in Iran, trade disputes and Washington's relationship with Taiwan.

Trump reportedly did not acknowledge Xi's warning, but the United States has long supported Taiwan militarily.

During a tense summit in Beijing, Chinese President Xi Jinping sent a clear message to US President Donald Trump regarding Taiwan. The talks underscored the fragile state of…