Comment by machomaster

It still has enough equipment and manpower to easily get through Baltics and defeat Germany and others. Fortunately for the latter, Poland is in the way and can perhaps put enough of a fight.

The thing that you are missing is the huge development in drone technology. Ukraine and Russia are the top2 countries that know how to use this technology as part of the military action, and Western countries would have a rude awakening as nails. More technologically advanced "tanks" would not matter much.