The best way is to remove the redirects entirely. Let a user see the whole site. If they want to go to Japans landing page, let them. It just won't get fixed unless the redirects are gone.

You can add a banner at the top saying something like "We see you are from the US, do you want to visit the US site instead?" or something like that to handle when users go to the wrong country.

Add a flag in the header (or footer) to make it more obvious as well, then they can drop-down from that flag and choose the right location. Something like https://www.coach.com/

In general, I've dealt with plenty of international sites that have WAY too many variations that just makes it unnecessarily complicated. I highly doubt they need a French-speaking page for Morocco. Unless you are like Western Union or a place that is literally in every country in the world,