This invasion is an egregious violation of international law. Putin's ultimate aim is to restore the Soviet empire, even if it takes massive bloodshed and false pretexts such as calling the 2014 Ukrainian revolution after an election a "coup". This unprovoked attack is the latest chapter in Putin's Orwellian attempt to rewrite history.
NATO and the US have ignored Russia's security concerns by breaking its promise not to expand eastward in return for German reunification. These concerns are legitimate and taking them seriously would have avoided the Ukraine tragedy.
There is a 15% chance that Ukraine will receive a security guarantee from another country before 2024, according to the Metaculus prediction community.