Can you pay in rubles in Sri Lanka?

No, rubles are practically not accepted anywhere in Sri Lanka. Exchanging rubles is very difficult, and if you do find an exchange office, the rate will be extremely unfavorable. It's better to bring dollars or euros.

You can learn more about this topic in our honest and reliable guide here - https://nashaplaneta.net/asia/srilanka/valuta-sri-lanka

How much does a visa to Sri Lanka cost?
Where to buy alcohol on the island?
Which resort do you recommend for the first time?
Follow the link, all these questions are discussed in the chat - https://t.me/srilanka_travel_chat