For the Icelandic cod, a very small fraction is caught by the Faroese on the border of EEZ. It's been known for a long time that young cod from Iceland often drift over to east Greenland, where they grow up and then sometimes go back and spawn when they're adults in Icelandic waters. It's been quite a long time since that happened. At the moment, though, there are cod coming up in east Greenland that are most likely of Icelandic origin.
There is no agreement between Iceland and Greenland regarding that. Understandably, the view in Greenland is that they should fish it before it goes back to Iceland. There is obviously another view in Iceland on that. These cod do not respect borders, but they are not a huge part of the cod stock.