Iraq’s military has a long history of wielding Russian weapons, MiGs, AK rifles, and the Iraqi tanks are all Russian Soviet inventions. In fact, if Saddam hadn’t been a secular opposition to Iran, we would have stayed hostile to him due to his Soviet alliance.
Maybe, but you need trained pilots to fly those planes. Even if you found the old MiG pilots, they would still need flight training and time to get up to speed. Not that it can’t be done, but a week (or even a month) is not realistic.