No such policies exist, except in the deranged mind of your typical Putin apologist. This was a land grab pure and simple.
Russia has two main interests in this. It's safety and its financial security.
Russia had an agreement with the US that if it allowed the reunification of Germany the US would expand NATO no further. The US agreed to this but despite pleas again and again it has just moved further and further up to Russia's borders and in 2008 it announced that it would soon be taking Georgia and Ukraine into NATO as well. Lavrov warned the US that if it did not stop Russia would have to move into those areas. The US did not stop. Russia is a very large country and it seems that Ukraine being in NATO would mean Russia would be very vulnerable to attack by NATO at any time.
By 2014 the US was deeply involved in the politics in Ukraine and the differences in the desire to be close to Russia the East or the EU the West. They taught the Ukrainians to act in an undemocratic way against those in the East and we had an 8 year war here. Ukraine only being able to do this due to US weapons and US and UK military training. All of this is about Russia being concerned about its security and to be frank I see their point.
Now when this fighting broke out in 2014 after the President had been ousted by the West of Ukraine because of his choice over who he thought could help Ukraine best, Russia thought it might as well take Crimea while it was there. Crimea having for some reason being given to Ukraine in 54 - something Russia expected to make no difference as they were both in the Soviet Union. Something which did make a big difference now they were no longer working together. Russia wanted Crimea because of its strategic position and Russia wanted Crimea because gas has been found around it and Russia does not want Ukraine to be competing with them over that. They said it was because of the Russians living in Crimea and that went down well with people at home but given how the US was moving NATO including Ukraine to completely circle it Russia did need Crimea and anything else it could get to protect itself from NATO having the ability to pop in and take what it wanted at any time.
Russia then moved over to the East and tried to get them voting to join Russia. In truth at this time the majority of East Ukrainians strongly wanted to stay in Ukraine. I hear the Donesk region also has oil.
Ukraine has chosen to have bad relations with its neighbour while holding onto the shirt tales of NATO, Russia's biggest rival. The US had previously promised not to do this and had it not, Russia would not have agreed to the reunification of Germany.
The US knew where this would lead. It had been told where it would lead and why and yet it continued working towards it.
Now we are on the verge of nuclear war.
So security is the reason why Russia came into Ukraine. Security and gas (or oil) was the reason it took Crimea.