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The Project 21631 lead ship 'Grad Sviyazhsk' was laid down on August 29, 2010. At present, the state customer has received five ships of the type. 'Grad Sviyazhsk' (delivered in 2013), 'Uglich' (delivered in 2013) and 'Velikiy Ustyug' (delivered in 2014) were issued to the Caspian flotilla, while 'Zeleniy Dol' and 'Serpukhov' (both delivered in 2015) were put into operation with the Baltic fleet in Autumn 2016. According to the open sources, Russia`s Navy is to receive 12 corvettes of the type.
The Project 21631 corvettes are armed with the Kalibr missile system stored in the 3S-14 universal eight-cell vertical launch system. Kalibr can strike both surface and land targets. The combatants` armament suite also features a 100 mm A-190 naval gun and an AK-630-2 Duet close-in weapon system. The ships are also fitted with 3M-47 Gibka launchers. The combatant has a length of 75 m, a displacement of 949 t, a speed of 25 knots, an endurance of 10 days, an operational range of up to 2,500 nautical miles and a crew of 52 servicemen.
The Project 21631 corvettes participated in the operation in Syria. In October-November 2015, they launched 3M-14 cruise missiles from the Caspian Sea and in August 2016 - from the Eastern Mediterranean.
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