Blockade has more economic reasons than political. Even if we find a way to solve this problem, people will be able to find other problem areas, on which they could put pressure (as it was, for example, with Crimea blockade, and today we don’t actually know if it goes on or not). The solution to the blockade’s problem lies in Donbas’ reintegration into Ukraine.
As soon as we get Donbas back, the subject of blockade will be settled up. That’s why I suggest thinking how we can return Donbas and not how to push it out of Ukraine.