In fact most of Ukraine's manufacturing base is situated in the Eastern and Southern region of Ukraine, and many important agricultural exports like Wheat and sunflower seeds from Ukraine comes from this region. More than 50% of the world's neon gas comes from Ukraine, which also comes from this region, as a by product of the steel industry. If Russia controls all this, Taiwan is going to run into serious trouble with their semi conductor and chip making activities, as Taiwan is branded an unfriendly country by Russia.
That is why adopting the Minsk Agreement was never the intention of Ukraine and it's backers in the first place. It was just pulling wool over the eyes of the two breakaway republics and was never intended to be adopted by Ukraine and it's backers. They had all the while wanted to take over Donbass and Luhansk. That is why they thought joining NATO would increase their bargaining power.
And what the Ukrainians did since 2014 was committing genocide, using neo Nazis elements, to kill and cow the two breakaway republics into submission. Most of those living in the two areas are Russians and, since 2014, Putin had been gritting his teeth and watching them being harassed to no end. His patience obviously ran out finally. He had to step in to support the 'liberation' of Donbass and Luhansk, which the West calls 'invasion'. Anyway since 'surrender' has been called an 'evacuation' pardon me for using the word 'liberation'
Now that Russia controls most of those important Ukrainian economic zones, the die is cast for Ukraine. The Western and Northern regions of Ukraine will be turned into a basket case.
They are boasting about taking back Crimea in order to control the region, but with what?
Perhaps with the USA talking of sending warships into the Black Sea to prevent Russia controlling the Black Sea, and thereby holding on to Crimea, ostensibly is making Ukrainians feel emboldened into thinking that retaking Crimea is possible. That is the USA modus operandi of pouring oil over fire and expanding the conflict. That means direct confrontation between USA and Russia. Biden needs to save his mid term and he thinks this is going to make it happen.