Chinese and American trade negotiators concluded their two-day meeting in Stockholm without a resolution to avert tariffs from skyrocketing back to ultra-high levels that formed an effective blockade on trade between the world’s two largest economies.

The United States and China have agreed to work on extending a deadline for new tariffs on each other after two days of trade talks in Stockholm concluded on Tuesday, according to Beijing’s lead negotiator.

The U.S. and China had agreed to pause most of the sky-high tariffs on each others’ goods amid trade negotiations – but that pause is set to expire in August.