none of the kinds of services that are plagued with scams. All they offer is for Western men and Russian and Ukrainian women to post profiles and to communicate through "Interest" messages and site mail messages, and instant messages.
And when you start contacting Russian women on these sites, you WILL contact some scammers.
However, if a Russian woman is just one potential option for you in your love search, you may want to check out International where searching the entire Cupid Media database is far easier.
At the end of the day, it all depends on the type of service you're looking for.
I review Russian Cupid (formerly "Russian Euro.com") and Ukraine Date together because they are virtually identical sites differing only in the geographical locale of their Russian and Ukrainian women clients.
They are both part of the Cupid Media network of sites that specialize in international online matchmaking.