The two leaders spoke by phone on Thursday, following weeks of worsening tensions between Washington and Beijing.

Earlier this week, China hit back on Trump’s claims the Asian country was in breach of a new trade agreement, struck last month following talks held in Geneva, Switzerland, countering that the U.S. itself was undermining the deal with new sanctions.

A key component of the Biden administration’s China strategy was a focus on bolstering ties with allies and partners to counter Beijing’s growing global footprint. Trump’s approach to China — and the rest of the world — hinges on tariffs and trade. How effective is that?