Why did Putin demand that Russian gas be paid for in rubles?

[Northern_Piper]

Currency clauses were discussed in this thread; is that the one you’re thinking of?

Given the current situation, what are the implications for someone who has a large amount of Russian and Russian-backed debt?

Hypothetically, say I owed hundreds of millions of dollars to Russian banks, high-net-worth Russians and western banks that made loans backed with Russian collateral? In light of current events, what type of financial challenges could I expect?