Iran is good in defense only the navy will not fare to well in international waters alone, im skeptical of their supply network and also their capability for extended operations beyond territorial waters, from my last reading it doesn't look like Iran has much in the way of Oiler's and stores ships from my recollection it has one modified Ol class oiler from the 1970's which was purchased from the UK.
However the Iranians have conducted extended operations in the gulf of Aden working with the international community against Somali pirates and they do have small dry stores ships and a capable vessel for fuel that is ocean going, given the size and cost of the operation any patrol in the Atlantic i would say would be a small affair and limited in its operational scope.
A Moje class frigate in January 2018 sank in the Caspian sea due to running aground in poor weather perhaps they are some what limited in their capabilities in ocean going deployments.
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