Governments come and go throughout history. It's pure hubris to imagine that the map is complete and won't change. The Ukranian people will still be Ukrainian if their government falls and a "puppet" government is installed by Russia. The USA helped overthrow and install Governments all around the world. Some still exist, but some have fallen and all in my relatively short lifetime of 65 years. The Vietnamese remain Vietnamese. The Iranians remain Iranian. The Iraqi remain Iraqi, etc.
I know some professing Christians that see Christ as a revolutionary who has come to topple Governments and free the world from tyranny. I'm pretty sure that they're all democrats.
While scripture declares that the Kingdoms of this world will all become Christ's at His return, I see absolutely nothing that justifies rebellion in scripture or any teaching of christ that justifies war. I actually see the exact opposite.
I think that there's a soliloquy in Hamlet where Shakespeare examines the nobility of war for a righteous cause, but Christ tells His disciples to get a sword so that He can be counted with the transgressors in His arrest.
War is not an expression of love, but of judgment. So, I guess the question is whether or not its our place as a nation to judge other nations. I don't believe that the USA was ever Christian though many colonists were, so I don't expect our government to operate in a Christian fashion or according to Christian principles. However, we have on multiple occasions justified our warfare as righteously preserving our way of life, which is government speak for protecting business interests that contribute significantly to our economy, such as arms manufacturing and construction (for reconstructing destroyed infrastructure and housing.)
Vietnam fell and I'm still waiting to see the rest of the dominoes fall. Putin is being compared to Adolf Hitler, but who really knows his ambition? I think he's just a dying man who glories in his service to the Soviet Union and wants to see its scope and power restored, but power is certainly a corrupting influence.
I don't believe that Putin will end his war until he achieves his goal in waging it, but at this point I don't believe that he will live long enough to see any fruit from a victory. He's pitted brother against brother in a conflict between people with blood and cultural ties. That didn't go well for Abraham Lincoln and Lincoln was far more righteous than Vladimir Putin.
I'm inclined to believe that the only winners in a nuclear conflict will be the cockroaches. I also believe scripture and I'm not sure that these are times when the world is looking about and saying "peace and safety," so I don't believe that the end is here quite yet. I think that the man of sin will come as a peace maker with solutions to global problems. The problems exist, so I'm reasonably sure that the "Son of perdition" must be close behind.
Right now, nobody wants a world War except Volodymyr Zelensky. NATO is a defensive treaty organization intended to protect NATO countries and Ukraine is not a NATO country. If Putin has his way it never will become one, and this is a professed goal in his war. I'm just wondering who will fill the power vacuum when Putin dies. It could be someone with greater ambition or someone more reasonable, and I think we'll be finding out real soon.