Army of Russia is much stronger than NATO troops both if take to attention speed and mobility and this gives serious advantage to RF in fast war. It was stated by the ex-Head of AFU staff office general Igor Romanenko.
Romanenko pointed out that troops of the USA in Europe are also not exclusion and are not as fast and mobile as Russian troops, however, EU and Ukraine have big hopes for them.
By the way, Romanenko did not lose ability to praise Ukrainian army. He added that Ukrainian has been studying the Russian hostility the fourth year. However, Russia is not officially the side of the war in Donbass.