No magic needed. Russia has some modern gear that they make themselves. They have some well trained soldiers. They know how to design modern gear. They know how to build more gear. They know how to train good soldiers.

What they can’t do is fix their problems overnight. In just ten years they could fix the problems. Putin is old and statistically unlikely to live ten more years. Their system of government is vulnerable to the military running a coup and taking over so it is unlikely they will fix their problems, but they could.