Insight into BJ tactics ?
This is from 2018, when he was Foreign Sec to May's PM - he obviously thinks there is mileage in convincing the EU he's nuts:
https://www.politico.eu/article/brexit-boris-johnson-donald-trump-all-sorts-of-chaos-says/
U.K. Foreign Secretary Boris Johnson praised Donald Trump and said there would be "all sorts of chaos" if the U.S. president was in charge of Brexit.
Johnson was speaking on Wednesday at a closed-door gathering at the Institute of Directors in London,
an audio recording of which was obtained by BuzzFeed News and published Thursday.
Speaking to Tory activists at the event, Johnson said:
“I am increasingly admiring of Donald Trump. I have become more and more convinced that there is method in his madness.”
“Imagine Trump doing Brexit,” Johnson added. “He’d go in bloody hard … There’d be all sorts of breakdowns, all sorts of chaos. Everyone would think he’d gone mad. But actually you might get somewhere.
It’s a very, very good thought.” 
< unfortunately, that is oinly effective, if ever, when the mad leader ha the might of a superpower.
When done by the leader of a medium-sized power in a deep hole, it invites only derision, not fear >