The best news about studying Japanese is that no matter where you are in the world, you can improve your Japanese. As long as you have access to the internet, you can find ways to practice your listening, speaking, reading, and writing. You can find Japanese practice groups online to practice with. You can also practice your listening skills by watching Japanese dramas or anime. 
 
Bottom line, the answer is no: it doesn't matter at all which country you are in. Wherever you are, you can start learning Japanese or improve your Japanese. Truly, these days, if you want to become fluent in Japanese, and you aren't currently fluent, the only reason is: "YOU ARE LAZY". Remember the Break Diver's Creed: No Rules. No Excuses. No Regrets.