a second batch in June 2011. Deliveries were continued in 2012 and 2013. Russian Defense Ministry signed a contract for 40 helicopters in August 2013. First 8 upgraded helicopters were delivered in 2014. In total, 40 helicopters were delivered in 2014. Long-term government contract to supply modernized Mi-8AMTSh was signed in Ulan-Ude in August 2013 and provides for the delivery of unique machines – the first production batch with improved resource performance including significant savings on maintenance during the life cycle of the helicopter. Mi-8AMTSh passed to the Defense Ministry obtains a larger capacity engines VK-2500 with an upgraded (reinforced) transmission that provide objective control of exploratory work, and make the use of the helicopter in the highlands and hot climates more efficient. 13 helicopters were delivered in 2015. 8 helicopters were delivered in the first half of 2016. More than 20 Mi-8AMTs and Mi-8AMTShs were delivered to the Russian Interior Ministry in recent years. Mi-8AMTSh-VA arctic version is also supplied to the Russian Air Force and Naval Aviation. The first batch of Mi-8AMTSh for 2017 was delivered in late May. A new delivery in June 2017. 13 more in early 2018. A new large delivery in June 2018. The last delivery held in December 2018. A new delivery of a special modification held in early 2019. New deliveries in November 2019 and April 2020. 10 Mi-8AMTSH-VN Special Ops helicopters are on order since summer 2019 and the first helicopters reportedly entered service as of late 2021. 2 helicopters were delivered and 6 modernized with the Vitebsk onboard defense system in July 2020. Mi-8MTKO Night attack conversion of the Mi-8MT and Mi-8MTV helicopters. Known in Belarus as Mi-8MTKO1. Mi-8MTD Electronic warfare version of the Mi-8MT. Mi-8MTF Aerial photography variant based on the Mi-8MT Mi-8MTG Electronic warfare version of the Mi-8MT with "Gardenya-1FVE" single H/I-band jamming system. Export designation Mi-17PG. Mi-8MTI (NATO Hip-H EW5) Electronic warfare version of the Mi-8MT with "Ikebana" single D-band jamming system. Also known as Mi-13, export designation Mi-17PI. Mi-8MTPB (NATO Hip-H EW3) Electronic warfare version of the Mi-8MT with "Bizon" jamming system. Export designation Mi-17PP. Mi-8MTPSh Electronic warfare version of the Mi-8MT with "Shakhta" jamming system. Export designation Mi-17PSh. Mi-8MTR1 Electronic warfare version of the Mi-8MT. The Russian Air Force (VVS) received three new Mi-8MTPR-1 electronic warfare (EW) helicopters on 4 March 2014. Mi-8MTPR-1 is a standard Mi-8MTV-5-1 with a 'Rychag-AV' active jamming station installed on