Is Russia in a deep economic crisis?
The Russian economy has been in an recession since 2014, when oil prices plumited. The Russian debt to GDP ratio is still very low though:  below 20%, compared to over a 100 for the United States. This is because Russia had a huge stash of cash before the recession, which has shrunk from over 91 billion in 2014 to 32 billion. If this trend continues at some point they will have to start borrowing money to pay for expenses. But I don't see them going bankrupt anytime soon, because their debt to GDP ratio is so low so investors will lend them money against low interest rates.