GENEVA—Senior economic officials from the U.S. and China concluded their weekend trade talks Sunday without announcing details of their discussions to ease the continuing trade war between the countries.

The U.S. and China had “productive” trade negotiations over the weekend, U.S. officials said Sunday, without announcing any further details.

Substantial progress” made in US-China trade relations after two days of talks in Switzerland is likely to boost sentiment in Asia, according to some strategists, while others were awaiting further details.