If he takes on this harsh, illegal action against another State, and bring Navy warship to test the Israelis, arrest him. No diplomatic Immunity. This guy is a bum, provoking Israel at every opportunity. Interestingly, Egypt hasn't said a word. Perhaps they know what they are dealing with in Gaza, and side with the Israelis.
Japan arrests U.S. activist featured in award-winning documentary 'The Cove' (DPA)
from the article: Report: Erdogan considering visiting Gaza to 'break blockade'