WASHINGTON—The Biden administration is poised to send a significant number of Abrams M1 tanks to Ukraine, settling a rift that threatened the unity of the alliance supporting Ukraine at a pivotal moment in the war, U.S. officials said.

The move, which could be announced as soon as Wednesday, would be part of a broader diplomatic understanding with Germany in which Berlin would agree to send a smaller number of its own Leopard 2 tanks and would approve the delivery of more of the German-made tanks by Poland and other countries.

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