I just checked my box, and there was no warranty (international or otherwise) in the box, just a product registration card. It specifically states that it will not affect warranty coverage. That was fine for me, as I purchased a separate Mack Diamond Warranty that covers all the usual stuff PLUS impact and water damage.
Also of note: the AC adapter provided with this camera allows charging of the battery IN the camera only. This would have been an issue for me, if I did not already have a charger for the BCG10 battery from a previous Panasonic camera.