Ukraine gave up their nukes due to American assurances as to Ukraine's defence.
I am very pro Ukraine, but those nukes where never "Ukranian", they where Soviet nukes, staffed and manned and made by Russia.
This is like if USA puts nukes in Sweden under NATO, are they suddenly Swedish nukes? No.
Are they Californian nukes or DC nukes? Possession is nine-tenths of the law...