This is wrong. The gotcha underpinning this point denies reality of the situation, that Ukraine had warheads and the technical capability to take control of those warheads. There is no discussion here.

That's an idiosyncratic take on the facts that basically everyone else agrees to interpret otherwise.

Ukraine and weapons of mass destruction

Ukraine, formerly a republic of the Union of Soviet Socialist Republics (USSR) from 1922 to 1991, once hosted Soviet nuclear weapons and delivery systems on its territory.[1] The former Soviet Union had its nuclear program expanded to only four of its republics: Belarus, Kazakhstan, Russia, and Ukraine. After its dissolution in 1991, Ukraine inherited about 130 UR-100N intercontinental ballistic missiles (ICBM) with six warheads each, 46 RT-23 Molodets ICBMs with ten warheads apiece, as well as 33 heavy bombers, totaling approximately 1,700 nuclear warheads that remained on Ukrainian territory.[2] Thus Ukraine became the third largest nuclear power in the world (possessing 300 more nuclear warheads than Kazakhstan, 6.5 times less than the United States, and ten times less than Russia)[3] and held about one third of the former Soviet nuclear weapons, delivery system, and significant knowledge of its design and production.[4] While all these weapons were located on Ukrainian territory, they were not under Ukraine's control.[5]

In 1994, Ukraine agreed to transfer these weapons to Russia for dismantlement and became a party to the Treaty on the Non-Proliferation of Nuclear Weapons, in exchange for economic compensation and assurances from Russia, the United States and the United Kingdom to respect Ukrainian independence and sovereignty within its existing borders.[6][7] Almost twenty years later, Russia, one of the parties to the agreement, invaded Ukraine in 2014 and subsequently also from 2022 onwards.

https://en.wikipedia.org/wiki/Ukraine_and_weapons_of_mass_de...

Btw, reference [5], used to justify the absurd claim that those weapons were in Ukraine's territory but not under its control, goes like this:

{{cite Hansard |url=https://publications.parliament.uk/pa/cm199293/cmhansrd/1993... |title=Nuclear Weapons |speaker=[[Jeremy Hanley]] |position=Minister of State for the Armed Forces |house=[[House of Commons (United Kingdom)|House of Commons]] |volume=227 |date=June 22, 1993 |column=154 |access-date=September 9, 2018 |quote=Some weapons are also possessed by Ukraine, Kazakhstan and Belarus, but these are controlled by the Commonwealth of Independent States.}}

So it's basically the words of a UK MP assuring his audience that, nooo, don't worry, Ukraine doesn't control its WMD.