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"Write what you know" is a guideline, not a law, or every book would be an autobiography. If you want to write about other countries, you say you've done a lot of research, which is a great start....
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/12830 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/12830 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
"Write what you know" is a guideline, not a law, or every book would be an autobiography. If you want to write about other countries, you say you've done a lot of research, which is a great start. That will keep you from making basic mistakes, like having your characters drive on the incorrect side of the road or dress inappropriately. Beyond that, either visit the other country in question and get your own experiences, or find one or several natives of that country to act as your cultural nitpicker. Or both.