Reports that Iran is calling this an escalation and so on, need to note that Iran has been supplying missiles, drones and explosives/munitions to Russia for the war in Ukraine for years via the Caspian Sea shipping
Two key arms running ships reportedly hit by Ukrainian drones (OWA-UAVs) in Caspian: Russian flagged PORT OLYA 2 (IMO: 9481881) - sanctioned Russian flagged BEGEY (IMO: 8943210) - sanctioned Oil platforms & 1 x Pr.1241 TARANTUL Class missile boat also reportedly hit