The coastal part of Ukraine has always been weakest position. The Russians have already closed all exits from Melitopol, with that, the Ukrainian military fled to Zaporizhzhya, probably the next Russian advances will be in that direction and also towards Berdyansk.The Crimean Front is going really well.
"Looks like Russian troops have entered Mykolaiv, a major strategic city in southern Ukraine, on the road to Odesa. Their Crimean axis of advance is making the most progress of any others"