Re: A strategic decision....
" it appears that the UK Ambassador to the US was leaking classified information."
Interesting. Is that how it's being reported in the US? Or are you just making a statement based on some hazy, misremembered fake news?
Has the US already forgotten Cablegate? In case you have forgotten, that was when a huge amount of US diplomatic reports were leaked showing US ambassadors and their staffs very candid opinions of their host countries, including close allies.
In other words, what embassy staff are paid to do. Luckily for the US, most world leaders not only have thicker skins than your much beloved POTUS, but they also understand that this is how the world works and didn't throw their toys out of the pram.