Goldeneye has made the key point here (visas). For a non 'Summer Sun' type destination to succeed for UK locos, high volume short-breaks traffic is essential. A town of 60,000 inhabitants (and how many local hotel beds?) cannot support a high volume operation on it's own, and any border crossing into Russia brings strict visa criteria into play. One of Finland's principal attractions is it's wilderness appeal ... not good news for high volume short-breaks traffic. And Russia is a definite no-hoper for high volume city-breaks trade whilst visa restrictions render the country cumbersome and artificially expensive to visit. I'm sure Russia has good political reasons for keeping it's visa requirements, but it's tourist trade will always be a niche market whilst they remain in place. Competing destinations have price and convenience on their side.