Yes (big agricultural resources, much more moderate climate than most of Russia, Russia wasted no time with taking possession of those resources in occupied regions and selling off the produced and sucking up the revenue) but it is also trying to colonise territory and get more Lebensraum for Russians, including ethnic cleansing of people refusing assimilation, filtration camps etc

Literally yes, so far the Kremlin has spent 20 times more on the occupied territories of Ukraine building roads, ports and other infrastructure than it spent on its own oblasts. ( Replacing or bypassing Infrastructure that has been destroyed or is still held in Ukrainian hands ) around captured stocks of natural resources . Literal resource extraction from occupied territory.