The Ukrainian unrest was engineered by NATO in the first place and it was Ukraine, not Russia that tore up the 1991 treaty which committed to not allowing a foreign military alliance (read NATO) on its soil and also to protect the rights and respect the properties of ethnic Russians. That treaty was validated at the time by the UN and by the Partnership for Peace in Europe.
Since you’re about to be accused of being a Russian propagandist, I think it reasonable to point out that the above is a hard fact that (unsurprisingly) never gets discussed in the US.
Further, I think your “bases on the Rio Grande” analogy is flawed. Russian bases on the Rio Grande would not be anywhere near as intrusive as NATO in the Ukraine. The better analogy would be that Texas and Oklahoma secede, and the Russian bases go in around Tulsa, Beaumont, Amarillo, and El Paso.
(Bases around Tulsa would evoke an immediate response, in that you’re a short drive from the Wal-Mart corporate headquarters. A strategic interest if I ever saw one. :-) )