Pronunciation of Russian has its regional varieties too. The Г/Х issue is probably the most noticable one - southerners (close to Ukraine) say Х instead of Г. Other well-known difference is А/О pronunciation - some Russians, mostly from the North of European Russia, pronounce молоко like it is written - молоко, while the majority pronounce it like малако. Every firstgrader in Russia has struggled with this problem. But wait... apparently those notherners have not? Never thought about that!