The U.S. military is considering sending Ukraine thousands of seized weapons and more than a million rounds of ammunition once bound for Iran-backed fighters in Yemen, an unprecedented step that would help Kyiv battle Russian forces, U.S. and European officials said.

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The challenge for the Biden administration is finding a legal justification for taking weapons from one conflict and transferring them to another. The U.N. arms embargo requires the U.S. and its allies to destroy, store or get rid of the seized weapons. Biden administration lawyers have been looking at whether the resolution creates any wiggle room for them to transfer the weapons to Ukraine, according to U.S. officials.

Suspected Iranian Weapons Seized by U.S. Navy May Go to Ukraine