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https://jamestown.org/program/the-realities-of-russian-military-shipbuilding-part-one/
https://www.rbc.ru/newspaper/2021/10/04/61571a279a79478e0bc0b011
https://jamestown.org/program/russias-military-boosts-electromagnetic-spectrum-capability/
https://www.rbc.ru/newspaper/2021/09/23/614a05889a7947146622a368
https://www.rosbalt.ru/world/2021/09/15/1921413.html