SINGAPORE— China said an initial probe found Nvidia violated the country’s antimonopoly law, heightening pressure on Washington during the latest round of U.S.-China trade talks that ended Monday.

Beijing’s antitrust regulator cited the violations in connection with Nvidia’s acquisition of an Israeli company that was completed in 2020. The regulator said the investigation was continuing, and it didn’t elaborate on the preliminary findings or say whether it would punish Nvidia.

Beijing approved the deal after Nvidia agreed to conditions including guaranteeing the supply of its chips to China. Since 2022, the U.S. government has blocked Nvidia and other American chip vendors from selling many of their top-flight artificial-intelligence chips to China.

Beijing’s move came just hours be

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