As of my knowledge cutoff in September 2021, Ukraine does not possess nuclear weapons. After the dissolution of the Soviet Union in 1991, Ukraine voluntarily gave up its nuclear arsenal, which was the third-largest in the world at the time. In exchange for relinquishing its nuclear weapons, Ukraine received security assurances from Russia, the United States, and the United Kingdom, among others, in the Budapest Memorandum on Security Assurances.

It's important to note that my information might be outdated, and there could have been changes or developments since then. For the most accurate and up-to-date information, I recommend consulting reliable sources or news outlets.
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