RE:A list of everything Russia has lost so far@ smallcaptdr - It's not only the energy markets that Russia wants control over. Russia wants Ukraine so that it can influence other countries by controling their food supply. Turkey and several African countries faced food shortages - and some still do - because Russia was blocking the shipments of grain from Ukraine to them.
In the 1930's the Russians starved to death 3 million people in Ukraine by sending in its army to take away the food that Ukrainian farmers produced. So besides controling energy, the control and confiscation of food is in Russia's play book too.