Hi Nick,
Thanks for your reply.
Before posting here I addressed the issue to Stripe of course. Here is their reply:
“Hi there,
Thanks for getting in touch. Stripe uses the ISO 3-letter code RUB for Russian Rubles (?and INR? for Indian Rupee). Are you using a third-party plugin or other source for your checkout form? In that case, you’d need to get in touch with the developer or support team for that plugin for assistance with properly displaying the currency on the checkout form.
Cheers,
Yvonne”