The Ukraine is split at the Dnieper River. Most of those to the West of the Dnieper River consider themselves Western, more closely related to Germans than Russians. Most of those to the East of the Dnieper River consider themselves Russians. When Nazi Germany were marching across the Ukraine in WWII, those west of the Dnieper River welcomed the Wehrmacht as liberators, and the Wehrmacht agreed that able-bodied men could join the Wehrmacht, since they were good Aryans. Both those Ukrainians from West of the Dnieper River and the Germans in the Wehrmacht considered those from East of the Dnieper to be a lower class of people, not quite human, Slavs suitable only to serve as slaves to their Aryan masters. Also, there were far more Slavs than the Aryans needed as slaves, so the number of Slavs needed to be reduced to provide Aryans with Lebensraum, but the Slavs were not to be totally exterminated as the Nazis planned to do with some other ethnic groups.
In 1991, the Ukraine voted to leave the USSR, leave Russia, and become an independent nation. For 13 years, every president needed the support of both Eastern and Western Ukrainians. Then the US sent the CIA with money and weapons, and in a free and fair election where every gun got a vote, they elected a Western Ukrainian who declared that everything Russian was strictly prohibited: speaking the Russian language or going to the Russian Orthodox Church was a capital offence. The West considered this a very good law, and, of course, every nation must maintain the rule of law. The CIA remained as advisers to the government, who worked hard to enforce the law and kill anyone speaking Russian or trying to keep a Russian Orthodox Church open, and, again, the West applauded this bringing of peace and stability to the entire Ukraine. The evil Russians objected to this peaceful, advanced democracy where the CIA got most of the votes. Russia was a very weak state, and knew there was not much they could do. Russia did illegally annex the Crimea, which had always been part of the Ukraine ever since 1954, but the Ukraine cut off the river providing all the water to the Crimea, and begged the West for materiel with which to return the Crimea to the Ukraine. Also, in the south-east of the Ukraine, some ethnic Russians had kept some materiel and continued illegally speaking Russian and attending the Russian Orthodox Church. Of course, the Ukraine did its best to enforce the law against these heinous criminals and made every effort to kill them all, but with limited success. They managed to legally execute about 15,000, but there were more than 2 million of these criminals. The Ukraine begged the West for more materiel so they could enforce the law, and the West promised that materiel would be coming, but later.
After the collapse of the USSR, which the CIA did not see coming, the CIA moved quickly and helped Yeltsin become head of the Russian state. The CIA gave Yeltsin all the vodka he wanted, and he let the CIA dismantle the Russian military, disable most of the Russian nuclear arsenal, dismantle Russian industry so rebuilding the dismantled military would be impossible, and even disrupted Russian education so there would not be educated people to rebuild. All very good work, applauded by the West. But Yeltsin got sick and had to step down. The CIA said they had a veto over who would be the next head of state, so the Russians picked an obscure mayor no one had ever heard of. The mayor applauded everything the US did. When the US proposed to the UN Security Council that they destroy Libya in 2011, Russia voted 'Yes!' When the US proposed to the UN Security Council that they destroy Syrian in 2013, Russia did not vote, so the motion passed by a large majority. But this obscure mayor was secretly rebuilding Russian industry, the Russian military, Russian schools, and the CIA did not notice. But Russia remained very weak relative to the US, the US could have demanded regime change, and the mayor knew he would either have to step down or see the US completely destroy Russia. So he did pretty much everything the US demanded.
Until 2022, when he announced that the good, Aryan Ukrainians who were strongly pro-US and should have remained in charge would be removed as the heads of the Ukraine, along with the CIA. The world was furious. Or at least the West was furious. And this includes Turkey who closed the Hellespont to Russian ships, and Switzerland who usually remain neutral. (Threats of countermeasures by the US might have influenced Switzerland and Turkey, or maybe the Aryans in both countries had achieved control of both states and all good Aryans know that the Western Ukrainians and the Americans were doing the right thing.)
The UN Security Council voted 11 to 1 with 3 not voting to condemn the Russian aggression in the Ukraine, so the resolution lost, since Russia inherited the USSR veto. The Ukraine were furious. They said that was wrong, that Russia have no right to the Soviet veto. Russia must either be downgraded from a permanent member of the Security Council to an ordinary member of the UN, or ejected from the UN for violating the UN charter, and the US agreed.
So on 28 Feb 2022, the US announced that 12 members of the Russian UN delegation are losing their seats, they are no longer allowed in the US, and so are no longer allowed in the UN. Russia protested that UN delegates must be allowed to enter the UN, but the US say 'NO!' The US want to see if there is anything Russia can do about having 12 members of its UN team removed. If it turns out the US can remove 12 members with no repercussions, why not remove all of them? As of today, Russia still have their representative on the security council, but if the US can ban 12 members of the Russian UN delegations, why not ban all of them? If the US get away with banning 12 with absolutely no consequences, the US will probably say no Russian is allowed a seat in the UN, and just about all of the UN will agree that the US has the right to unilaterally cancel Russia's formerly permanent membership on the Security Council. Then the Security Council will vote unanimously to condemn the Russian aggression, the Russian attack on the law in the Ukraine, the Russian support for capital felons speaking Russian or attending the Russian Orthodox Church in the Ukraine.
The US know they now have a secure defence against a Russian nuclear attack. If the US think the Russians are planning such an attack, they have a huge arsenal of nuclear weapons in Eastern Europe, plus an anti-missal defence system in Eastern Europe. The threat of a Russian attack will prompt an US prophylactic attack with missiles that can reach their Russian targets in less than 5 minutes, before Russia can possibly respond, so most of the Russian nuclear arsenal will be destroyed before Russia can deploy it, and the anti-missal system will stop all the rest, so Russia no longer have MAD, the US have the AD of any nation that dares to defy the US, The US want every nation to know that when the US say 'Jump!' the only allowable answer is 'Yes, sir. How high?'
Russia remain convinced that the US conviction that MAD no longer exists is wrong, that Russia has managed to rebuild its military to the point where it can stand up to the US. Which means standing up to the US and just about all of Europe plus Turkey and Japan.
Some of us think the world is in a far more dangerous place than we thought we were in 1962 when I had to sleep on the floor. The USSR put nuclear weapons in Cuba, and the US said if they did not immediately remove those weapons, it meant nuclear war. We lived in a tiny village, and all our relatives who lived in big cities came to stay with us, since everyone figured all major cities would be destroyed, but not the tiny villages. So they got my bed and I got the floor.
Now, of course, since 1987, we know everything we heard about the Cuban missile crisis was a lie. The US had nukes in Turkey, and Khrushchev demanded they be removed. Or else. And put nukes in Cuba.
So Kennedy called Khrushchev and said, 'I have to run for re-election and you don't, so if you'll say the US got everything we demanded, I'll pull all those nukes out of Turkey and let you send inspectors to verify, but you have to say you capitulated because the US was too strong for the USSR to stand up to us.' Khrushchev agreed, so it wasn't until 25 years later when the documents were declassified that we learned there was never a real threat of a nuclear war, it was the US who capitulated to all the Soviet demands.
But this time, I think there really is a threat, because the American leadership believe that MAD no longer exists, that the ultra-advanced US defences mean there is only the AD of any nation that dares to defy the US, including Russia and the PRC. And the US have been wrong about just about everything, almost certainly including this.