Huh? Russia tried very hard to seize the areas on that map with oil and natural gas. They got pushed back to the border fortunately. But the plan was certainly to seize it all (Kyiv too).

It's obvious why Russia would fight for the coast: access to the sea. Also not on those particular maps is the vast areas of prime farmland. Again, lots of it in areas they tried to occupy.

Re: access to the sea, that was one obvious reason to take Crimea. But that unexpectedly backfired on Russia as Ukraine has developed their anti-shipping capabilities to the point where the Russian Navy has mostly been pushed out of the Black Sea entirely. Of course, that outcome doesn't change the fact that they obviously wanted to seize all those areas.