Sometimes sellers can ship to Kuwait, but if they can't then you need a US or UK forwarding mailbox. It's basically a mailbox that sellers can ship to and whatever ends up in that mailbox gets shipped to you here in Kuwait by another courier company.
So usually if a seller can ship to Kuwait it looks something like this:
Seller (Amazon, eBay etc.) >>>>UPS/FedEx/USPS/etc..>>>> Kuwait
If the seller can't ship to kuwait and only offers US shipping then it would look like this
Seller (Amazon, eBay etc.) >>>>UPS/FedEx/USPS/etc..>>>> Forwarding Mailbox (Aramex/MyBox/etc)>>>>Kuwait
head over to www.shopandship.com for more details