Support.  The status quo was stable, and is a good starting point for any future development, including possible future split.
If we're going to split the article, I can offer two possible ways: we could split off Nazi occupation in 1941-1944 into an article of its own, or we could split the Stalin's era of 1940-1953 from the 1953-1991.  Both are reasonably well supported by available literature, and are independent of each other.  I'm unconvinced that split is needed, but I think I can support either or both of these splits  if the consensus arises, naturally. Εμπρος!