I grew up internationally and I love international representation from outside of North America, Israel, Australia and Brazil have created some very well established international teams. This is going to be quite costly, but the international community is extremely supportive.
Estimating the budget here (All USD):
Event Registration $6000
Tools and Materials: $4000-$6000
Being international, shipping times & prices do not work in your favor, you'll want to buy as much ahead of kickoff as possible, source your Aluminum and Hardware locally, and buy a good variety of materials from Andymark and Vexpro ahead of time. You are limited to $4,000 in actual parts on your competition robot.
Travel: $20,000-$40,000
Its probably most cost effective to go to the Israeli regional if you can get your visa's in order.
Just make sure you talk to FIRST HQ to give them a heads up and make sure all of your bases are covered with Visas and Customs. I have contact info if needed.