The prototype of the MC-21 plane that can carry up to 211 passengers was presented in the hangar of the Irkut aircraft manufacturer in the Siberian city of Irkutsk in a glitzy ceremony broadcast on Russian state television.
Medvedev also pledged that Russia would keep updating its domestically-produced civil aircraft.
The MC-21 passenger jets which can be up to 42.3 metres long and have a wingspan of 35.9 metres are expected to replace the ageing, Soviet-era Tupolev Tu-204 and make their first test flights by the end of the year or in early 2017.
The aircraft, 30 percent of which is made up of foreign parts, is scheduled to come into service in late 2018.
Irkut said that it has signed contracts with a number of airlines, including Russian flagship carrier Aeroflot, UTair and the Kyrgyzstan Air Company, for the delivery of 175 planes and that it had preliminary agreement to sell another 100 planes.
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Russia has its hopes set on competing with the Airbus A320 and Boeing 737, which dominate the international civil aviation market.  The unveiling of the MC-21 comes five years after Russia’s short-haul Sukhoi Superjet aircraft came into service and has since had serious technical issues.
Russia’s aviation agency in 2013 grounded the Superjets which have had technical issues with landing gear and leak detection systems since they came into service in 2011 over a series of technical issues before being allowed to resume flights.
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