Russian VKS is lagging behind in Su-57 production. The backbone of the Russian aviation Su-35 will be modernized to Su-35SM. Here's what the upgrade entails.| Bulgarian Military Industry Review
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The first variant was developed in the Soviet Union as early as the 1980s. The version, initially referred to as the Su-27M, had a revised airframe, duck wings, an enlarged radome for the N-011 radar and improved avionics.| Bulgarian Military Industry Review
The Sukhoi Su-34, as an export version under the designation Su-32, is a two-seater fighter-bomber developed in the Soviet Union by the Sukhoi design office, whose series production started in April 2006.| Bulgarian Military Industry Review