Double spends for anyone who can connect to both sides of the network. Essentially, there will be two ledgers, an International ledger and a Russian one. If you spend on the Russian ledger, the International ledger will still have your money. When the network rejoins, whatever ledger has the most hashing power behind it will be chosen as the correct one, and all the transactions from the other one will be retried on the new global ledger. If the network saw a new transaction spending a previous transaction's outputs, it would be rejected, as well as any spends referencing that transaction, and so on.
Thank you, that's exactly what I wanted to know.
This happened already.
I guess I've missed the news, any links for my lazy ass?
Bitcoin sounds like a nice investment for dictators willing to further screw their populaces.