> mainly US
You missing historical order here. Ukraine gave up their arsenal long before they decided to drop Russia as an ally and play with Europe/USA (latter happens after "Maidan"). So at given time point (when Ukraine signs memorandum) they done it with _only_ Russia' protection in mind (as there was single country in past and they're both slavic)
> By 1996, Ukraine transferred all Soviet-era strategic warheads to Russia.
> Ukraine received extensive assistance to dismantle ICBMs, ICBM silos, heavy bombers, and cruise missiles from the __U.S.__ funded Cooperative Threat Reduction Program
Citing wiki: > Euromaidan was a wave of demonstrations and civil unrest in Ukraine, which began on the night of __21 November 2013__ with public protests in Maidan Nezalezhnosti (Independence Square) in Kyiv
Easy, uh?
The only convoluted thing here is your own history as you see it.
> Russia was considered the biggest threat to Ukraine independence starting with Kyivan Rus'
Until Yushchenko there was no such president. Relations never were stable, though.
Look at A.I. Kuzmuk paper "Ukraine military doctrine evolution" if curious. VDU-1993 and VDU-2004 never considered Russia as a threat. VDU-2004 states there is no direct military threat against Ukraine, just possibility of being involved into bigger conflict. Kuchma even cancelled statement about NATO integration in VDU-2004, by making it more smooth.
Er, Ukraine is in Europe. Out of 10, how would you rate the USA's efforts at stopping Russia there so far?
Part of Russia is also in Europe.
Ukraine paid the 'entry price' that was asked of them to be protected by USA, (and France, UK, Russia, China) by surrendering their nuclear weapons.
This was a level of vulnerability and trust in third parties the good citizens of USA (and the others above) would never for a second countenance.
The USA (and the others) willingly signed up to the deal [1]. And then failed to do any deterring when it was time to walk the talk.
[1] See https://en.wikipedia.org/wiki/Budapest_Memorandum_on_Securit...
That's not the problem of Ukraine. The whole world sees what agreements like that are worth. Alternatively, if that would be the binding memo, and USA broke the "legally binding" promise, nobody would prosecute. The reaction of the world would be about the same.
Bottom line: non-bindingness doesn't matter here.
China is a looming threat. If you don't see that, I don't know what I can say.
Take away America's military and see what happens.
Tibet, Hong Kong, Taiwan, Spratleys, 9-dash, water rights, Belt+Road indebtedness, Crimea, Ukraine...
The US has to be strong out of necessity, and we get treated like shit for it. America is far from perfect, but it's Democratic and celebrates individualism and free speech. And I'm not persecuted for being LGBT. I'd hate to be in Russia or China where I'm told I can't think my own thoughts or have my own preferences.
If we didn't have to pay so much for our military capabilities, maybe we'd all get to enjoy the same free health care and social programs that Europe, Canada, and other nations enjoy.
Europe needs to carry some of this weight.