The only reason for them to not accept NATO membership of a neighbor is if they're planning to invade that neighbor.
Russia's desire to not have NATO neighbors rather makes the point of why there can be no peace between Ukraine and Russia - Ukraine understands that without real guarantees of security, any 'peace' with Russia is a farce that only lets them prepare for the next invasion, except this one will start closer to home and be better planned.
Russia's desire to not have NATO neighbors rather makes the point of why there can be no peace between Ukraine and Russia - Ukraine understands that without real guarantees of security, any 'peace' with Russia is a farce that only lets them prepare for the next invasion, except this one will start closer to home and be better planned.