The Russians plan to drill into Lake Vostok ahead of the US. They plan to use an existing hole that ends >100m above the top of the lake. The science community is not real happy with the Russians because their hole contains fluids that may contaminate the lake. The Russians insist that their plan is safe and their hole is clean enough. I doubt they will listen to others involved with the lake because the Russkies don't have money to make a cryobot; their existing hole is their only shot at the lake.
Contamination may be a moot point though. Satellite and ground sensing has turned up dozens of new lakes over the past few years. The lakes exchange water through burst floods that happen at the base of the ice. Some of the drainage paths actually connect to the sea. So, as others have noted, the lakes may not be "pristine", let alone isolated from the outside world for millions of years. Needless to say, this has been cause for disappointment for the folks who hope to find exotic organisms in Lake Vostok.
My four-year-old (on my lap) has asked that I insert this:
gregS