‘The A-10 was highly fear by the Russian military and it has proven itself in combat.’
Not at all. A-10 is not absolutely useless in nation-state warfare against near pear opponent but it would suffer enormous losses against any force which has either air force of its own or/and relevant air defences.
It is one thing to go against camel jockeys armed with rifles and RPGs, but now imagine doing a job opposing hundreds of trained troops with manpads, 23mm anti-air artillery and dozens of theater defence SAMs. Not to mention even a Vietnam era fighter jet would easily shoot down as many A-10s as it would be possible considering a number of missiles and cannon shells available.
It would be a fish in a barrel situation and a A-10 pilot would be that fish.
I still maintain that the F-35 cannot fulfill the mission of the A-10. The F-35 is not the be all do all is is promoted to be.
Living up to your FRName, eh...?