LONDON — When visiting other countries, it's always nice to make a good impression.

This is especially crucial for politicians, who often travel to meet other senior figures and discuss important stuff like trade and friendship agreements.

There are often lots of media hanging about, and the politician in question — who in this case happens to be London Mayor Boris Johnson, who's been on a four-day visit to Japan to discuss stuff like trade and Japan hosting the 2019 Rugby World cup — would normally be hoping for cheerful photos of himself standing around smiling and shaking hands with important people.

What Johnson probably wasn't hoping for was a series of photos of him flattening a 10-year-old boy during a game of street rugby.

Here's Johnson with some school children in Tokyo, about to join in with a street rugby tournament.

Image: Stefan Rousseau/PA Wire/Associated Press

Now let's flash forward to a second-by-second replay of the tournament's key moment.

And here comes Johnson with the ball, looking determined. Image: Stefan Rousseau/PA Wire/Associated Press

His opponent is 10-year-old Toki Sekiguchi, who we see here positioning himself to make the tackle. Image: Stefan Rousseau/PA Wire/Associated Press

But Johnson used to play rugby in his school days, and he's clearly not one to shy away from a tackle. Image: Stefan Rousseau/PA Wire/Associated Press

Just take a moment to examine Johnson's facial expression in this photo. What's going through his mind? Image: Stefan Rousseau/PA Wire/Associated Press

Now a close-up for the moment of impact. Image: Stefan Rousseau/PA Wire/Associated Press

OOOF. Image: Stefan Rousseau/PA Wire/Associated Press

This is probably the moment when Sekiguchi began to regret his decision to go in for the tackle. Image: Stefan Rousseau/PA Wire/Associated Press

Take a second to look at the facial expression of the guy in the background. Image: Stefan Rousseau/PA Wire/Associated Press

That is one brave tackle from Sekiguchi. And to be fair, he did bring his opponent down. Image: Stefan Rousseau/PA Wire/Associated Press

The crowd seemed to appreciate the whole thing, too. Image: Stefan Rousseau/PA Wire/Associated Press

Luckily, Sekiguchi escaped from the tackle unscathed. But, judging from his weary expression in this last photo, we can only imagine it'll be awhile before he sets foot on the rugby field with Boris again.

Never again, Johnson. Image: Stefan Rousseau/PA Wire/Associated Press

Never. Image: Stefan Rousseau/PA Wire/Associated Press

Again. Image: Stefan Rousseau/PA Wire/Associated Press

UPDATED 15 OCTOBER 11:40: Here's a GIF of the all-important moment...

You can watch the full video here.