Ukraine problem is different.

After the collapse of the USSR, Ukraine inherited significant stocks of Soviet weaponry, and Ukrainian military personnel were trained to operate this equipment.

Regarding the transition to NATO standards, this process requires time and resources. Mastering new weapon systems, changing supply chains, and adapting tactics are complex challenges for any army. Many countries transitioning to the Alliance's standards face similar challenges.

The Russian defense industry continues to produce equipment compatible with Soviet standards, which creates certain difficulties in the current conditions.

Also, not being able to buy cheap and effective Chinese dual usage drones to not offend the USA is a huge limit.