So, could you clarify what you were doing at the supposed time of the tweet? Is there any evidence for that in e.g. your browsing history (not to prove it to us, but to yourself)? If it's "I was on Twitter, viewing Ukraine-related tweets" then "you tweeted this yourself (most likely in some altered state of mind)" is an almost unavoidable conclusion. With zero malicious intent, I would recommend one or all of carbon monoxide detector, discussing this situation with a close friend, and/or medical checkup. The similarities to this famous thread are uncanny: https://old.reddit.com/r/legaladvice/comments/34l7vo/ma_post...
One more far-fetched theory would be that Twitter has a race condition or caching problem, which caused someone else's tweet to be posted under your account. But the odds of this happening to only you in particular (and in an on-topic manner!) are essentially zero at Twitter's scale.
One more far-fetched theory would be that Twitter has a race condition or caching problem, which caused someone else's tweet to be posted under your account. But the odds of this happening to only you in particular (and in an on-topic manner!) are essentially zero at Twitter's scale.