Russia has doubled the production of missiles for its air-defence systems, Defence Minister Sergei Shoigu said on Tuesday. He made his comments during an inspection of defence factories in the city of Yekaterinburg in the Urals, according to his ministry. The production of launchers for the S-300 and Buk air-defence systems had also been increased. They should be put into service by 2024. The minister did not provide exact production figures. The Russian air-defence system has recently shown weaknesses in its use against approaching Ukrainian drones. Drone strikes damaged a liquefied natural g…