> The huge border between Russia and Ukraine is completely flat grassland. This means that to Russia, Ukraine joining NATO is an unacceptable risk because that

> The huge border between Russia and Ukraine is completely flat grassland. This means that to Russia, Ukraine joining NATO is an unacceptable risk because that border is impossible to defend against NATO tank invasion, and the flatness go all the way to Moscow. This can be reversed and then Russia was supposed to be able to use its supply of 20000 prewar tanks to just swipe through Ukraine and stop at Uzghorod like an Iraqi 2003 style thunder run. It tried to, but failed miserably. Maybe 19th and early 20th century doctrines are no longer alive with guided ammunition and spotting drones constantly in the air. Actually we can see it in Ukraine today, the moment when Russia setups an armored column it will often get disassembled by drones and artillery kilometers before reaching the zero line. It requires major effort and sacrifice to move frontline few meters on open terrain.