I am assuming no one standing and cheering for us “standing up to Russia’s incursion” would have an objection to Russia fomenting a rebellion against Mexico in the northern states, installing a puppet government, and then putting a missile shield in place on our southern border?
Russia's record during the 20th century is that of a nation that has annexed neighboring territory at every opportunity, including land that has never been historically Russian. It imprisoned the nations of Central Europe for over 4 decades after WWII, conducting mass killings of class enemies, emplacing dictators who answered only to the Kremlin, and preventing the victims of their tyranny from escaping to the West. Like Germany, Russia has a lot to live down. Unlike Germany, whose record of evil ended 70 years ago, Russia's criminal past ended less than 3 decades ago. That it continues to have Lenin statues in public places, and Lenin's carcass remains in its place of honor near Russia's seat of government is a hot poker in the eye of everyone who has ever suffered under either Russian-imposed or -sponsored tyranny.
The appropriate analogy is what the European reaction would have been to Germany conducting a second Anschluss back in the early 1970's, roughly 3 decades after the end of WWII. Russians see themselves as Europe's savior, when the reality is that they, along with Germany, were arsonists who helped burn Europe to the ground via the Molotov-Ribbentrop Pact. Russian perfidy remains fresh in the minds of just about anyone who grew up during the Cold War.