There were supposedly 82 weapons unaccounted after Ukraine gave up the 1,754 Soviet-manufactured units they had in storage on former Soviet bases in Ukraine.*
It is very likely that two or three of them wound up in places they were not supposed to be. After 40 years, they cannot be in operable condition without extensive remanufacturing, but the cores could still be used for "dirty bombs".
So, "Where's Waldo?"
*Pick whatever numbers you like. These are the ones I found. Somebody has a spreadsheet with exact model numbers and serial numbers for every unit. I don't have that spreadsheet or know anyone who does have it. A general view is "1700+ nuclear weapons, 80+ unaccounted".
Maybe Ukraine's Azovs have a couple stashed away, just waiting for the day they were betrayed by both Russia, and the USA.