What is happening in Ukraine?

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All the world press is busy with the issue of Ukraine, and there are statements at the highest level, even from the US President, that Russia has taken the decision to invade Ukraine. Tomorrow, Saturday, there will be a contact between Putin and Biden... The contact, I think, will be decisive if Putin obtains assurances that Ukraine will not be part of any official or unofficial security/military framework linked to the United States and NATO. I do not believe in the outbreak of war... In the scenarios they put in place are that Russia will for 48 hours make a massive firefight with aviation, artillery and missiles to destroy all the Ukrainian military infrastructure that could clash with them during their land advance, and that Russia will then advance from the West to reach Kiev within 48 and there is no force to stop them and change The system of government ... but logically and according to my follow-up to the press, the priority for Russia is in two directions, preventing any Western military presence, even if one shot, on the Ukrainian lands, and the second is the demographic factor that takes huge population centers located on the eastern border directly with Russia, and their number is close to 10 million (and Russia is very obsessed with the issue of population and gives great financial temptations to those who give birth to children or to Russians who are in regions outside Russia and want to move to them) besides that they are giant cities inhabited by Russians and also have gatherings Giant industrial in Ukraine, even at the level of the former Soviet Union.
The matter has become confusing and it is difficult to imagine what will happen, as history does not move in a logical or within the framework of inevitability.