China claims democratically governed Taiwan as its own territory and regularly describes it as the most sensitive and important issue in its relations with Washington. Taiwan’s government rejects Beijing’s sovereignty claims.

Taipei will be watching for any sign that Trump, who has unnerved partners with his transactional approach to alliances, could soften or reframe longstanding US policy on Taiwan in return for China buying American aircraft or agricultural goods and easing economic pressures.

Speaking to reporters at parliament in Taipei, National Security Bureau director-general Tsai Ming-yen said the key focus of Trump’s summit with Chinese President Xi Jinping was likely to be management of their issues, “not fundamental problem-solving”.

“As for the Taiwan issue, I believe the Chinese communists may attempt some manoeuvring during the talks,” Tsai said.

“However, on this point, the US has continuously reaffirmed through both public and private channels that its Taiwan policy has not changed,” Tsai said.

“Taiwan is likely to be a topic of conversation between Trump and Xi, but both countries understand it is in neither of their interests to see any ‘destabilising events’ occur with regards to Taiwan,” US state secretary Marco Rubio said this week.

Tsai said there were many contentious issues between China and the US that are difficult to fundamentally resolve in the short term.

“Our assessment of the overall US-China situation is that it will likely present what might be described as a fragile stability,” Tsai added.

The US is Taiwan’s most important international backer and is bound by law to provide the island with the means to defend itself, despite a lack of formal diplomatic ties.