The Biden administration will work with allies to transfer Soviet-made tanks to bolster Ukrainian defenses in the country’s eastern Donbas region, a U.S. official said Friday.

The decision to act as an intermediary to help transfer the tanks, which Ukrainian troops know how to use, comes in response to a request from President Volodymyr Zelenskyy of Ukraine, the official said. It marks the first time in the war that the United States has helped transfer tanks.

The official said the transfers would begin soon, but declined to say how many tanks would be sent or from which countries they would come. They will allow Ukraine to conduct long-range artillery strikes on Russian targets in Donbas, said the official, who spoke on the condition of anonymity because he was not authorized to speak publicly.