The above answers are mostly totally out of context. The USA, UK and Communist Russia leaders decided to let Russia occupy what then was Poland, Hungary, Czechoslovakia, East Germany, Romania, Bulgaria and Yugoslavia. However Tito refused to allow Russian troops to enter Yugoslavia and remain there as an occupying force. Stalin played ping-pong with the Western so-called leaders and the whole Yalta Treaty was an abortion. Russia was also allowed to occupy the previously independent Lithuaania, Estonia and Latvia - which became slave states under Stalin as part of the Soviet Union.
The Communist regime departed from Russia in 1991 and never returned. The idea that Russia is still under Communist control with an imperial policy as to expansion is propaganda BS. Russia never since 1991 invaded any independent country - there were minor problems with the new borders of countries - but that over time was settled. The new free countries like Georgia and Armenia are factual examples.
So why is Ukraine different from the rest? The Ukraine did not give up nuclear bombs as suggested, In the Ukraine Independence negotiations and in the Ukraine Constitution it as agreed that the independent Ukraine would be nuclear free and by 2003 the nuclear bombs were all transferred back to Russia. So how could the present nuclear issue become an issue in Ukraine.
What became an issue under Obama was corrupt activities of the US leadership of the Democratic Party with some allies from the Republican Party in both Russia and especially in the totally corrupt Ukraine Government. Since independence in 1991 the Ukraine Government was the most corrupt in Europe and a long list of especially Democrat leaders were involved in Ukraine and Russian corruption. That ranged from Obama himself and included Clinton, Biden, Pelosi Schumer, Schiff, Podesta and virtually every Democrat leader in the USA. Obama was directly involved in the Uranium 1`scandal for which Russia paid $142 million to the Clinton Foundation from where the money was distributed to the various beneficiaries. By the way Mueller was appointed as Special Council in that case and found nothing untoward about the issue and his report was a white-wash to protect the Obama regime. Since 2014 the USA provided billions in aid to Ukraine - and the famous 10% kick back scenario became in full force with Clinton on her own getting $38 million assistance through the corruption vehicle - the Clinton Foundation. Hunter Biden was his father's agent in Ukraine corruption - the Biden's have a joint bank account through which the corrupt money flows.
By 2019 Trump found out about the 10% kickback issue and instructed that all foreign aid assistance should be suspended until clarification could be attained about processes followed and the 10% kickback system be stopped. For instance the corrupt activities in Ukraine of Pelosi and Schiff were stopped in its tracks and that led to the Impeachment Joke in 2019.
The fact is that Trump was an impediment to continuation of US politician corruption in Ukraine. The FBI knew about everything going on in corruption in the USA by especially Democrat Politicians in Ukraine - but refuse to act on it in an effort to prevent any scandal involving the Democrats becoming public knowledge. . The election of the ultra-corrupt Biden as President opened the gate to ultra-corruption by the Democrats in Ukraine. The famous $40 billion aid package to Ukraine was a farce and a further $1 billion was voted by the House in aid money in Ukraine. Two days after that money was provided to Ukraine Pelosi and Schiff were in Kiev to deal with the usage of the money and the handling of the kick-back money - nothing else. The 40 billion did not go to the Ukraine in cash - it was for replacement of second-hand armaments collected from the US Army and the beneficiaries were the US Armaments industry, The said Industry was known for decades as a kickback institution for US politicians. It started in Vietnam and is continuin g to this day. Every defense force contract is inflated to cater for kick-backs and one of the kick-back vehicles has been Haliburton largely controlled by the Cheyne's.
There is a massive amount of money benefitting USA politicians in the present Ukraine scenario. Biden himself is involved and that account for the undermining of the Minsk agreement as to a ceasefire in Ukraine and the establishment of a proper Constitution for Ukraine. Instead of abiding by the agreement the corrupt elements in the USA Government - supported by the media - undermined the agreement,
Is Ukraine a democracy at present? It was and is not one. Since the 2014 coup the country has NO constitution and the Minsk agreement that would have led to a proper constitution was aborted. After the2019 election Ukraine gradually deteriorated into a one party dictatorship - at present the ruling party is the only one allowed to operate politically - all opposition parties are banned and all Russian speaking members of the Ukraine Parliament have been arrested.
In the meantime Russia is NOT a one-party state like the media and especially the USA want everybody to believe. In the end if the media are fed with enough lies they use the Goebbels method - if lies are repeated enough times people may start to believe they are the truth. That is why the conduct of some of our members are so ridiculous. They constantly believe every lie concocted by the media and this is just one of many such lies.