The action comes at a delicate moment for U.S.-Turkey relations, with Washington hoping Ankara will ratify NATO membership for Sweden when the Turkish parliament reconvenes in early October.

The United States and its allies imposed extensive sanctions on Russia after its invasion of Ukraine, but supply channels from Black Sea neighbor Turkey and other trading hubs have remained open, prompting Washington to issue repeated warnings about the export of chemicals, microchips and other products that can be used in Moscow's war effort.

"For the past 18 months, we've shared our concerns with the Turkish government and private sector and informed them of the significant risks of doing business with those we've sanctioned who are tied to Russia's war," said the senior Treasury official, speaking on the condition of anonymity.

It said the former has made hundreds of shipments to sanctioned Russian entities that are part of the supply chain for producing military drones used in the Ukraine war, while the latter has sent sensors and measuring tools into Russia.

The broader sanctions package targets Russia's industrial base, maritime sector and technology suppliers, as well as facilities producing and repairing Russian weapons systems, the official said.

Ties with the U.S. have been strained over Turkey's reluctance to support the bids of Sweden and Finland to join NATO after Russia invaded Ukraine.

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