- Ukraine's flat terrain merge with Russia's mainland and there are no natural obstacles between them. That means if Ukraine joins NATO Russia needs to expand its spending on military infrastructure and troops to secure its western border with Ukraine which Putin can not do. This could bankrupt Russia economically.
- Russia's territorial integrity would be jeopardized by NATO's involvement in Ukraine. The Black Sea Coast of Ukraine is located around 750 kilometers from the Caspian Sea. A trained military force could cover that distance in a day or two. As a consequence, a land bridge between the Russian heartland and the North Caucasus would be built, crippling the Russian state.
- Ukraine is stockpiling strategic arms from the USA and it has a large quantity of anti-tank missiles which could be proved deadly for Russian tanks. Also, Turkis drone seems deadly against Russian weaponry and Ukraine has established licensed facilities to produce them.
- Ukraine is looking forward to developing its own missile program which is a serious threat to the Russian mainland.
Do you think there is anything more serious than this which causes this situation?