That's why I don't think Odessa will see any more than it has done so far. The Russians will be well aware of the tunnels there as well. Miles of them with entries all over the place.It seems unlikely the Russians are going to manage to feed a supply line much further west, unless they can use Transnistria as a base.
More people have come out of the steel works. Reports of a Russian ship being hit. Report that Russia has launched from a submarine.
Given the nature of most of the fighting I think progress will be slow and drag on. Most of it involves taking various sizes of population centres which is what the Ukrainian troops are defending. It would be interesting to know what equipment they have and where it is. The defence seems to mostly result in troops retreating back into the population centres. The weapons supplied means tanks and helicopters can't be used as they might be to shift troops / get them in. Tanks have to work at range. They have been shown doing that several times - both sides but I did see Ukraine troops closely following a couple of tanks in a field but would suspect it was a training exercise. Or maybe a way through lines away from population centres.
A UK centre for strategic studies man reckons neither side has air superiority. Russians have more so in the east and Ukraine more so in the west. He put in down to Ukraine's mobile anti aircraft stuff and Russia mostly needing to use low level attacks that drop bombs. I did see one of the radar units these use with a pretty severe hole it in it. There is also self propelled units - one Ukraine one shown damaged. No idea how many they have.