The Ukrainians are better trained, theyre just having problems with the fact that the Russians are using unique technology like "mines" and "planes".
Russians are employing this dastardly new technology called "mines" which no army on earth has encountered before, least of all those of the NATO members like France, Germany and the UK.
Most of the world agreed to ban mines in the Ottowa Convention, but as usual the countries that really matter (US, Russia, China, etc.) didn't sign it and aren't bound by it.