Well tue US wanted to replace the A-10 with F-35... Just there's nothing to replace these CAS airplane anyway.The Su-25 has an empty weight of 10 tons and max takeoff weight of 19 tons. Engine power of 88 kN. The Yak-130 has an empty weight of 5 tons and a max takeoff weight of 7 tons. Engine power of 48 kN. It is simply not possible to replace the Su-25 with the Yak-130.