If a British defence minister was found to have shared details about a live military operation in an unofficial messaging group with colleagues, they would be sacked. That President Donald Trump has tried to dismiss the revelation that his top defence and security team not only did just that but accidentally included a journalist in the chat will be watched with deepening horror by US allies and growing glee by American enemies. In public, the UK government is still insisting security ties with the US are as strong as ever. US security breach latest: White House tries to distract from…