Sadly I think this is likely to be true and our best hope is stopping it now. If Ukraine fights back and causes large numbers of Russian casualties then the Russians themselves may stop Putin. I don’t think the younger generations have a rosy view of the Soviet era. I doubt younger generations of Eastern European countries view a Russian takeover as a good thing. I worked with Polish and Bulgarian doctors who spoke fluent Russian because they’d had to. It didn’t mean they liked or supported Russia. In fact they despised and detested Russia and were delighted to be free of it and this would be the generation now in their 60s so I doubt their children have been told stories of the good old days. They told jokes about Russians being drunks as did the Hungarians I knew. There was little respect for Russians among those who lived with them. I don’t think former Warsaw Pact countries generally will be clamouring to become part of mother Russia.It was 'only Crimea' and, before that, 'only South Ossetia'. If you want to look for historical precedent, it was 'only the Sudetenland' but German troops quickly went on to Prague. You can't appease these people, the longer it goes on the more we will wonder why we didn't act sooner when it was a smaller problem.