AMD Warranty is International.
If you purchased a legitimate Retail AMD Processor in a box. You have a 3 year Warranty on it from AMD from date of purchase. AMD Warranty takes affect once the Warranty from the Retailer expires first.
You must have purchased an official Retail AMD Processor inside a AMD Retail box to be illegible.
You can find out about your Warranty from Online AMD Warranty Request form from here: https://www.amd.com/en/support/kb/warranty-information/rma-form
The AMD Processor has all the information you need to fill out the form printed on the metal casing of the processor as shown below from AMD Warranty:
Here is the AMD Warranty Terms & Conditions for a Processor in a box: https://www.amd.com/en/support/kb/warranty-information/rma-03