Belarus and Kazakhstan are vassal states of Russia now and for the foreseeable future; possibly they will be annexed officially at some point, like the Crimea and probably Donbas. Sweden would probably still be neutral if it hadn't given up its nuclear weapons; it seems to be at significant risk of being invaded by Russia again (it was invaded in the 18th century and again in the 19th), which is why it joined NATO in March. That, in turn, puts it at great risk of going to war this decade even if it doesn't get invaded, for the first time in 200 years.

It's unclear if Belarus and Kazakhstan really had nukes in the first place such that they could "give them up"—as with Ukraine, the nukes stationed there were Soviet nukes, controlled by Moscow.

South Africa does seem to be doing okay, though. It's not that likely to be invaded by Zimbabwe, and since the end of apartheid, a civil war is looking increasingly unlikely.

Argentina, Brazil. although they say brazil is just a few days away of developing a nuclear bomb if it decides to. It would not be able to throw it anywhere useful tho at maximum south american neighbors