Gabriel, if you want to fly across the border, your first landing should be in an international airport, so in the vicinity of St. Petersburg it gives you no other option but ULLI. From there onward, you may be forced to hire a navigator to sit with you in the cockpit. Keep in mind that all airspace in Russia is controlled (no class G), and without Russian language you will be unable to communicate with Russian ATC - the only English-speaking controllers are on CONTROL frequencies (i.e. FIR/CTA control centres) or at international airports with scheduled foreign traffic.
Of course, you can also arrive on a scheduled flight and then fly at one of the local clubs, but again, you will be allowed in the left seat but officially you won't be a PIC - the current Russian legislation does not allow it.