The United States expressed concern Monday about the strengthening of ties between Russia and Iran.
"It should be a concern for countries not just neighboring Russia and Iran, but the world broadly," deputy State Department spokesperson Vedant Patel told reporters at a briefing.
"We have seen the havoc caused by Iranian-made drones that Russia has unleashed on Kyiv, targeting energy and civilian infrastructure, so of course this relationship is one that we are paying close attention to," Patel added.
Russia has used Iranian-made Shahed drones to carry out widespread aerial attacks on Ukraine during its full-scale invasion.
The tactic, which includes crashing the drones into targets, led Ukrainian officials to ask for anti-drone missiles to knock them out of the sky.
The Wall Street Journal reported on Monday, citing sources familiar with the matter, that at the same time as the expansion of military cooperation between Iran and Russia, the Russian government is helping Iran achieve advanced digital surveillance capabilities.