Drones violate UN Security Council Resolution 2231, the US State Department said
Kyiv was struck by so-called "kamikaze" drones on Monday, unleashed by Russia but believed to be Iranian-made.
The US agrees with the French and British assessment that the drones violate UN Security Council Resolution 2231, the US State Department said.
That resolution, linked to Iran's nuclear accord, bars Iranian transfers of certain military technologies.
Ukraine has identified the drones - or unmanned aerial vehicles (UAVs) - as Iranian Shahed-136 weapons. They are called kamikaze drones after the Japanese fighter pilots who flew suicide missions in World War Two.
"It is our belief that these UAVs that were transferred from Iran to Russia and used by Russia in Ukraine are among the weapons that would remain embargoed under 2231," said Vedant Patel of the state department.
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