Chinese officials have long used their willingness to cooperate to stem the flow of fentanyl to the United States as leverage in talks over broader disputes.

Beijing’s outreach to Washington over fentanyl created an opening for trade talks between the two nations, according to people in both capitals who are familiar with the matter, paving the way for a bilateral meeting in Switzerland this weekend.

Newsweek has contacted the White House and the Chinese Foreign Ministry for comment. President Donald Trump raised U.S. tariffs on China to a combined 145 percent, prompting the Chinese to retaliate with a 125 percent levy on American imports.