Independent Howitzer Artillery Battalion; the 975th Detached Naval Infantry Battalion (Kaspiysk); the 1387th Detached Air Defence Missile and Artillery Battalion; and the 530th Detached Electronic Countermeasures Company. Also, the flotilla has received 3 new Buyan-class stealth type river gunboats built by the St. Petersburg Almaz shipyard. On November 13 and 23, 2009, there were two separate sets of explosions at the 31st Arsenal of the Caspian Sea Flotilla, an ammunition depot, in Ulyanovsk. Ten servicemen died. The depot was to be closed. The first Russian warship equipped with the Caliber missile system entered service with Caspian Flotilla in 2012. On October 7, 2015, Russia's Defense Minister Sergey Shoigu announced that four Russian Navy warships in the Caspian Sea had fired a total of 26 Kalibr-class cruise missiles at the positions of the terrorist group ISIL in Syria. Up to 2020, further enhancements in the capabilities of the Caspian Flotilla were announced. In 2019, it was announced that an aviation component would be added to its capabilities involving the deployment of Be-200 aircraft and Mi-14PB helicopters with the Flotilla. Further air support is drawn from 4th Air and Air Defence Forces Army (HQ: Rostov-on-Don) in the Southern Military District. In 2020, the deployment of the Bal coastal defence missile system with the Flotilla was also announced. As of 2016, 85 percent of the Caspian Flotilla consists of modern ships and vessels. In 2014–2015, Flotilla received 3 Buyan-M missile corvettes, one modernized frigate and auxiliary vessels. On September 20, 2016, Rear Admiral Igor Osipov was replaced by Rear Admiral Sergey Pinchuk. In Dagestan, a regiment of the marine infantry was formed on December 1, 2018, as part of the Caspian Flotilla (CFL) of the Southern Military District (YuVO). To date, the new formation is fully staffed with modern weapons and military equipment, including BTR-82A armored personnel carriers, 120-mm self-propelled mortars 2S9 Nona, 122-mm howitzers D-30, unmanned aerial vehicles (UAV) "Eleron" and "Orlan". On March 20, 2022, the Russian Defense Ministry claimed that ships of the CFL had fired Kalibr-class cruise missiles at a Ukrainian fuel and lubricant depot in Kostiantynivka, Mykolaiv Oblast, supported by air-launched Kh-47M2 Kinzhal hypersonic missiles. Ships in service Frigates 2 Gepard-class frigates, Tatarstan, Dagestan (active as of 2021) Corvettes 3 Buyan-class corvettes, Astrakhan, Volgodonsk, Mahachkala 3 Buyan M-class corvettes, Grad Sviyazhsk, Uglich, Veliky Ustyug (all active as of 2021) 1 Tarantul-class corvette R-101 Stupinets Artillery boat 4 Gunboats