High-level delegations from the United States and China are meeting in London to try and shore up a fragile truce in a trade dispute that has roiled the global economy.

President Donald Trump and Chinese President Xi Jinping held a phone call Thursday amid ongoing tensions between the two superpowers — with a new in-person meeting planned soon.

Trump said in his Truth Social post that the hour-and-a-half conversation phone call was “focused almost entirely on TRADE,” while the Chinese readout singled out Xi’s stern warning on Taiwan – the reddest of lines for Beijing – and the issue of Chinese student visas.