How to avoid being invaded

You say that ukrainians did not want to be invaded?? Then perhaps they should have avoided the following:

Handing their country over to George Soros ,Bork Obunga, SlicKKK KKKlintler, Patricia Nuland and other transnational gangsters for nefarious purposes and usages.
Allowing their Nation to be made into a planetary epicenter for child trafficking, money laundering , and every other kind of major International gangsterism.
Shelling the innocent people of the Donbass on a daily basis after the Nazi takeover in 2014
attempting to implement genocidal policies ( Banning the use of Russian language in ethnic Russian regions).
Allowing American interests to construct and operate several dozen illegal bio-war Laboratories within their nation's territory. This action by itself would have constituted sufficient reason for Russians to invade.
Placing NATO weapons at Russia's doorstep from their territory despite repeated warnings from Russia that this amounted to Crossing an absolute Red line.
Attempting to actually join nato. All I've ever seen nato do is attack and bomb innocent people and I'm an American; Putin and Russian officials who have to deal with those wankers on a daily basis probably have more reasons for disliking them than I do...
Seeking to acquire nuclear weapons. Ukraine after all is not a legitimate nation; more like a Nazi army occupying land that has been expropriated from Poland, Romania, Hungary and Russia. Nobody wants nazis living nextdoor to them and especially not nuclear-armed nazis and double especially not nuclear-armed nazis who have no legitimate business even being there...

Ganeemead “Ukraine after all is not a legitimate nation;”

Parroting Putin’s lies again.

By your definition, Muscowy is not a legitimate nation as it occupies the land of Chechend, Tatars, Buryats, Yakuts, Mordvins and Chinese among others.