Chinese and American trade negotiators concluded their two-day meeting in Stockholm without a clear path forward 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.

Chinese trade negotiators and the White House said both sides are looking to potentially extend talks beyond an August deadline to resolve wide-ranging tariff disputes triggered by Donald Trump’s global trade war.