The UK thought they had a 50 year agreement with China to guaratee Hong Kong's democracy: https://en.wikipedia.org/wiki/Sino-British_Joint_Declaration https://e

The UK thought they had a 50 year agreement with China to guaratee Hong Kong's democracy: https://en.wikipedia.org/wiki/Sino-British_Joint_Declaration https://en.wikipedia.org/wiki/Sino-British_Joint_Declaration Turns out if the other country decides they are altering the deal, and you don't have any leverage - the bit of paper isn't worth all that much in practice. Would you repeat the same feat with Taiwan, if you were in Trump's place?