The big deal is once you have their system you can counter it leaving the troops without protection. the US can reverse engineer and learn how they plan to jam systems, which give you clues to how they are defending against US EW attacks. This reduces the Russian EW back to a low level.
The lost means that they will not get back to parity with current system for five to twenty years depending on how much money and brainpower they throw at EW.
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