Actually, its the other way around. Russia is on the way up. The only question is how quickly the improvement will set in. After losing more than 90% of its funding for hockey after 1991 (imagine if 90% of the funding for Canadian youth hockey just vanished), Russia sank to around No. 4 or 5 by 1995. In the last 5 years, with more than a decade of solid economic growth (now the 7th largest economy in the World), Russia introduced junior leagues across the country. For the first time, Russian kids are playing hockey in competition before age 17. There is no way for Russians to minimize the huge breakthrough that represents for identifying and developing mass talent. Probably less than 20% of the population has access to hockey as a career now, but by 2019, that number is expected to be closer to 60%, and within 20 years, 100%.
In the Olympics, the last of the Russian Soviet-era players (Fedorov, Zhamnov, Bure, Zubov, etc.) left the scene in 2002, and the 2006 team was really terrible (although there was the shutout over a weak Canadian entry, 2-0). In 2000, at Leningrad, Russia's star-studded WHC team (Mogilny, Bure, Yashin, Fedorov) finished in 11th place, but has won 4 Gold in the last 7 years. In 2010, Russia had one bad game, which was made worse by Nabokov giving up 6 goals in the first 24 minutes. In Sochi, again just one bad game against Finland, took them out of the medals, but the team was a big improvement over the past 2 Olympics.
The biggest weakness in Sochi was the lack of defensemen, but there are some good prospects on the way (Zadorov, Bereglazov, Tryamkin and Orlov). There is no way that Voynov or Kulikov will be on the team in 2018. Voynov is just too slow a skater to play on a large surface (he cost us the game against Finland), and there is no physical component at all to his game. I'm not sure why you mentioned Kulikov's name? Goaltending is there. There are some really good forward prospects in line, and if the defense is shored up as expected, I think Russia will be a much stronger competitor for a Gold Medal in 2018.