1. Considering that NATO Russia did not do its best to defeat Uzbekistan, let's consider NATO's concerns again. Because Russia has a vast territory and many areas bordering NATO and Russia, Russia has to guard against it.
If Russia puts all its energy into Ukraine now, go shopping with Ukraine and die together. Obviously, Biden wants to bring down Russia with the last drop of Ukrainian blood. After all, they are all Slavs' brothers, not Anglo-Saxons. Shopping and killing each other are not a pity for the proud Anglo-Saxon people.
In the final analysis, Russia still hopes to talk to the relevant wise men in Ukraine and solve the problem through peaceful negotiations. So as not to be deceived by the Anglo-Saxons.
2. Russia underestimated the enemy. This is Russia's fault. At the beginning, he underestimated the military strength of Ukraine and the resistance will of the Ukrainian army. He didn't go all out when he first attacked Ukraine, thinking that it wouldn't take long for the Ukrainian army to be defeated soon. Fruit was stubbornly resisted by the Ukrainian army, so that the initial blow was not successful.
The stubborn resistance of the Ukrainian army won him time and confidence from Europe and America to help him, which means that Europe and America feel that Ukraine can still resist Russia as long as it helps Ukraine and provides him with weapons. This gave the United States the idea of using Ukraine to bring down Russia. With the assistance of Europe and the United States, the strength of the Ukrainian army has greatly increased, and Russia has no ability to quickly defeat the Ukrainian army.
3. Inconsistent domestic public opinion Since the beginning of the war, there have been strong anti-war voices and many anti-war demonstrations in Russia. Many nationals who are in military service oppose joining the army and prefer to flee.
4. There are problems in Russia's military reform. In recent decades, military reforms around the world have focused on reducing troops and increasing other services. In this conflict, the Russian army failed to attack the city because the army was insufficient.
5. Insufficient preparation of strategic materials.
Russian weapons are mostly old-fashioned weapons of the former Soviet Union. The new weapons reserve is not enough to cope with the war, and it also lags behind the world in the research and development of new weapons, such as drones.