American expats are still required to file US taxes from abroad. This is because the US taxes based on citizenship, rather than on residence like most other countries.
While the tax treaties that the US has with around 100 other countries don’t alleviate expats from having to pay US taxes, the IRS has put in place some other mechanisms that do achieve this.
Expats Claiming the Foreign Earned Income Exclusion - What Income Qualifies as Being Foreign Earned?
Claiming the Foreign Earned Income Exclusion when Filing a Late Return - What US Expats Need to Know