Tensions have increased between Iran and Azerbaijan over road tax imposed on Iranian truck drivers that want to enter Armenia through Azerbaijan, over Azerbaijani ties to Israel and plans for a corridor linking Azerbaijan's Nakhchivan exclave with mainland Azerbaijan. The latter's occurence could see Tehran lose its connection to Armenia altogether, hindering its access to the regional market. While current tensions between Tehran and Baku have so far been confined to diplomatic tensions and military exercises along their respective borders, some fear that mounting tensions between the two countries could one day escalate into an all-out regional conflict.