I know the US became increasingly fast and loose with treaties during the Trump rein but it looks like the UK will be on this path with the Budapest Memorandum on Security Assurances apparently in the bin. Strategically it looks like Ukraine lost a great deal when it gave up the last of its nuclear weapons in 1996 in exchange for assurances on its security and sovereignty.
Not a great lesson for those countries considering their own nuclear weapons future. Nuclear weapons seemingly matter much more than treaties with the major powers when it comes to defending oneself. Now about that NATO treaty...