“The systems themselves were suffering failures and not performing to the standards that apparently the customers expected,” Kirby said.Asked how many Iranians were in Crimea and why, Kirby said, “I don’t have a number … What we do know is there’s a relatively small number that are.”Russia has deployed dozens of drones purchased from Iran to Ukraine and has used them in attacks in recent days, including in the capital city of Kyiv, according to Kirby and State Department spokesperson Ned Price.And will likely continue to receive additional shipments in the future,” Price told reporters at a separate briefing.“Furthermore, in light of Russia’s ongoing supply sort of shortages, we are concerned that Russia may also seek to acquire advanced conventional weapons from Iran such as surface-to-surface missiles that will almost certainly be used to support the war against Ukraine,” Kirby said.Asked how Iran’s support for Russia’s war effort could affect stalled negotiations to revive a 2015 nuclear deal between Iran and world powers known as the JCPOA, Kirby said the administration was currently focusing on Iranians protesting in the streets."