Very easy. First check with several newsagents in your city or the biggest close city. Be sure to visit several and to ask if "they have anything in russian" for example. The problem is not the newsagent itself but rather the distributor, who makes the choice. Then, when you have found one you like, you can get a subscription. Actually, most magazines will ship to your country if you don't mind the delay, so when you travel to your target country, buy many magazines to inspect them at home.

Also, many magazines and newspapers have websites where you can read some articles and even purchase the whole edition.