The United States is seeing more indications that Russia and Iran are expanding an unprecedented defense partnership that will help Moscow prolong its war in Ukraine as well as pose a threat to Iran's neighbors, the White House said on Monday.
As part of the cooperation, Iran is providing Russia with one-way attack drones, including more than 400 since August, national security adviser John Kirby said at a news briefing.
"This is about a burgeoning defense relationship" that allows Russia to kill more people in Ukraine and also enables Iran to stock up on its military hardware and pose a greater threat to its neighbors, Kirby told reporters.
Drones are the primary military help Iran is providing to Russia, which is seeking to acquire advanced-level types, he said.
The Unites States will be announcing additional designations targeting increased military cooperation between Russia and Iran, Kirby added.