If you only tried to pay directly by debit/credit card, try PayPal too. If the paypal also has this problem you can contact the support team.
I will tell you my experience may be useful for you. I am from India and I'm using Construct 3 for the last three years. Till March2022 I paid my subscription through paypal but suddenly my card keeps getting declined when I try to pay. After some research I think the issue was due to some regulation passed by the Reserve Bank of India against the subscription payment. After that I contacted the C3 support team they gave me their Paypal mail id and bank details for a direct bank transfer. I tried to pay through paypal as a one time payment and its accepted by my bank.
For a direct Paypal or Bank transfer minimum commitment is 1 year because its a difficult task to verify the payment each month.
Also contact your bank to see is there any issue in sending payment from Russia