The US and China have extended their trade truce for 90 days just hours before a jump in tariffs had been set to kick in.

An executive order signed by US President Donald Trump on Monday keeps in place an agreement from May, when the two sides temporarily suspended some of the tariffs on each others' goods.

The US had warned higher tariffs could kick in on Tuesday unless that truce was extended.

Talks last month ended with both sides calling the discussions "constructive". China's top negotiator said at the time that both sides would push to preserve the truce, while US officials said they were waiting for final sign-off from Trump.

A return of higher duties would have risked further trade turmoil and uncertainty amid worries about the effect of tariffs on prices and the economy.