There are numerous threads on this issue. But yes there is in fact a policy clause that would be violated if you attempt to do this.
Ordinarily you would be able to use a virtual credit card service with a fake billing address (if the VCC company permits this - I know the one I use does) to permit you to purchase from a different country. This is something I personally do with certain purchases (not EVE). However, one of EVE’s policies is that your billing information must be accurate; so unless you a legitimate card from that region (ie. a real Russian-registered card), you cannot do this without potentially getting in trouble with CCP if you get caught.
CCP recently raised Russian prices, so even if you were to break the rules and do this, you’d do so to limited benefit.
See:
Here is the most notable thread: