You can pretty much send however many tanks you want, but the level of surveillance and precision strike weapons on the battlefield today means tank pushes are not really a thing anymore. All aspects of war other than drones have to work in small teams (tanks and artillery work in pairs, infantry work in small fireteams) otherwise they’re just going to be found, targeted, then killed.
This, combined with state-of-the-art F-35 stealth fighters would be able to bypass the Russian air defenses and take out high value targets that are critical to the Russian supply line.
The f-35 is terrible and would probably be destroyed by Russias air defense which is the best in the world at the moment.
It’s just because it’s an attack on Russian owned territory.