Trump declares in tweet korean war to end
I'm not aware of any tweet from Donald Trump declaring the Korean War to be over. The Korean War ended with the signing of the Armistice Agreement on July 27, 1953, and it has been officially ended for over 68 years.
It's possible that you may be thinking of a different tweet or statement from Trump, but I'm not aware of any tweet from him declaring the Korean War to be over. If you could provide more context or clarify what you're referring to, I'd be happy to try to help you further.