i am not sure if this make sense, but i entered the warranty details of a recently purchased 500 gb freeagent seagate go on the warranty site with country as US and tried to check the status of it.
It showed me the correct date and also gave me the option for advanced rma or whatever. tried in random with a few other countries including uae, all showed valid.
so i guess seagate's case to international warranty should work.
though please note that nowdays freeagent drive come with both 2 year and 5 year warranty. the 2 year warranty models are slightly cheaper than the 5 year warranty hdds. i did my test with a 5 year warranty waala disk