How can i get the international warranty on my new phone .

No such thing exists. Warranty on an iPhone is only valid in the country of Purchase. The EU is considered a single country for warranty purposes.

Look up AppleCare+

Here's an AppleCare+ article: http://9to5mac.com/2015/08/05/applecare-plus-international-expansion-brazil-turk ey-spain/

snip

In the video, Bunch and an associate in charge of AppleCare+ say that the service will now become simpler to add for international customers. For example, if a Hong Kong resident travels to the United States, purchases an iPhone or iPad, and adds AppleCare+ to their purchase, their new device will become automatically registered with AppleCare+ in their home country…