as in good old times, using connections in the modelling community, Russian ones in this instance.
Generally, there are several problems
1. payment. you can't really use your visa or whatever. Paypal doesn't work too, unless a shop has a walkaround of some sort.
2. postage. Post works in general, both ways. takes around 3 weeks. but Arma doesn't send its items abroad. Numerous shops do (like i-modelist) but not Arma. BTW it just had a confirmation from i-modelist that they do accept Paypal via their partners in Kazahstan.
so, for generic stuff like zvezda you can either buy directly and payment and waiting time is not perfect but hey ho, or purchase via Bulgarian or Serbian shops directly or through eBay (countries are just an example).
Lots of stuff can be purchased via aliexpress or Taobao, reasonably priced in fact. (just had my reskit, quinta & flying leathernecks order from china)
but, if it's exclusive to this one shop, finding a fella who's willing to help of do a trade (you order hannants for him, he does arma for you) is the only way...