Recep Tayyip Erdogan is in Brussels for his first state visit as Turkish president. Given the war in Syria, Turkey is hard for Europe to ignore. It's a NATO member that's loudly against Russia's deployment on the side of Bashar al-Assad. The country has also taken in two million Syrian refugees. This comes with news that Russian planes violated Turkish air space, causing Turkey to scramble two F-16 fighter jets. How will events within Turkey impact the wider world?