The Russian su-25 came out in 1975, so how is that the new version of the A-10? What’s new in the last 10 or 20 years?
They completely re-did the Su25 with the Su-25SM in 2012 or so.
It is basically the same airframe and all new bits.
FWIW, The Ukrainians evaluated the A10 and decided it offered no benefits and a number of issues compared to the newer SU25.