re: Russia's history with the Crimea Region

Another main issue here is the Budapest Memorandum in regards to the Treaty on the Non-Proliferation of Nuclear Weapons.

Ukraine gave up their nukes, which was 3rd largest at the time. Pretty unreal. In return they got security assurances against threats or use of force against the territorial integrity or political independence of Ukraine as well as those of Belarus and Kazakhstan.

Well the US is claiming that Russia violated this memorandum, Russia is claiming that since there was a coup that the memorandum no longer applies to ANY part of Ukraine.

Russia is justifying further movement into Ukraine actually.

It's messy, and could certainly get worse in a hurry, but I doubt it goes that far.