Even Putin can't fund a war with no money.
https://www.washingtonpost.com/national-security/2025/01/10/russia-oil-sanctions-shadow-ships-biden/
https://www.nytimes.com/2025/01/10/us/politics/us-russia-sanctions.html
It's hard to get paid in worthless cryptocurrency, when you keep cutting telecom cables.
https://www.reuters.com/markets/currencies/russia-is-using-bitcoin-foreign-trade-finance-minister-says-2024-12-25/