An American police officer teams up with a Japanese convicted felon to take down a drug lord who set them up in a drug deal gone wrong.

1. Added a location.
2. Removed the second reference to “drug” – inferred.
Q: “deal gone wrong”, I get it, but is there something unique about this deal? Was the Cop’s partner killed? Something like that to spice this up 😉

"An American police officer teams up with a Japanese convicted felon to take down a Tokyo drug lord who set them up in a deal gone wrong"

I agree with Richiev. Certainly the odd couple aspect works. I'm thinking the X meets Y of this is BLACK RAIN meets 48 HOURS.

I think this is your best logline to date