Re 4., that's doable if the West renounces some of its existing economic sanctions against Russia, the Russians themselves have said as much recently.
It probably won't happen because the West doesn't like to see itself as being involved in the war (in a way similar to what Russia thinks about itself) and will try to resort to "Russia should unlock the blockade purely on humanitarian grounds!", which, of course, is the type of declaration which has no effect during a direct economic war (like the one the West and Russia are now waging against each other, on top of the military proxy war).
It probably won't happen because the West doesn't like to see itself as being involved in the war (in a way similar to what Russia thinks about itself) and will try to resort to "Russia should unlock the blockade purely on humanitarian grounds!", which, of course, is the type of declaration which has no effect during a direct economic war (like the one the West and Russia are now waging against each other, on top of the military proxy war).