On the 5th December 1994, the UK, US and Russia signed a security assurance with Ukraine in exchange for Ukraine relinquishing its nuclear weapons. At the time, Ukraine had the 3rd largest nuclear arsenal in the world; weapons left over from the former Soviet Union. The agreement was signed in Budapest, Hungary and as a result is called the Budapest Memorandum.
The full text of the agreement is available online at Memorandum on security assurances in connection with Ukraine’s accession to the Treaty on the Non-Proliferation of Nuclear Weapons. You can clearly see the signatures of British PM John Major, US President Bill Clinton, Russian President Yeltsin and Ukrainian President Kravchuk.

There are 6 main points of agreement in relation to Ukraine, its independence and a promise not to use force against it except in self-defence. Perhaps the most important point is point 4 which I’ll also type in full.

4. The Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and the United States of America reaffirm their commitment to seek immediate United National Security Council action to provide assistance to Ukraine, as a non-nuclear-weapon state party to the Treaty on the Non-Proliferation of Nuclear Weapons, if Ukraine should become a victim of an act of aggression or an object of a threat of agression in which nuclear weapons are used.
Russia broke this agreement in 2014 when it invaded Crimea. In hindsight the US and UK were too weak in their response which emboldened Putin in his full-scale invasion in 2022. If the US abandons Ukraine now it will also break the agreement.
What message does this send to Ukraine and other nations thinking about building their own nuclear arsenal? It says security agreements with the US and Russia are worthless and if you ever find yourself under attack you cannot depend on their earlier promises. It sends a very clear message that if you need a nuclear deterrent you have to build it yourself. In other words, don’t give up your weapons on the promise of peace for those promises are quickly forgotten when a new President comes to power.
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