It is very understandable. Russia has been on the receiving end of countless wars, Mongols, Germans, Japanese, Poles, Vikings, obviously they would reserve the use of nuclear weapons if they feel the homeland is endangered. No, you ignore the facts. The Bucharest conference categorically stated that Ukraine WILL become a member of NATO. It was just a question of time. Obviously when Yanukovych came to power and put in place a neutral stance, and withdrew NATO membership aspirations there was no war and no need to invade Ukraine. However, in 2014 came the Ukrainian "revolution", Ukraine openly flirted with the West, the EU and NATO all over again, Yanukovych was deposed. It was clear then that the danger of Ukraine joining NATO was greater than ever. Hence the Crimean war. The occupation came right on the heels of Yanukovych being deposed. In 2014 Ukraine OPENLY DECLARED it will seek to join NATO. Yet you claim it reaffirmed its "neutral status". Lol. Ukraine's parliament has voted to drop the country's non-aligned status and work towards Nato membership. https://www.bbc.com/news/world-europe-30587924