Russian President Vladimir Putin arrived in Tehran on Tuesday for a summit with Turkish President Recep Tayyip Erdoğan and Iranian President Ebrahim Raisi.
Why it matters: With Syria, Ukraine and oil on the agenda, all three leaders have something to gain from the summit. So, potentially, does the world, as Putin and Erdoğan will discuss a deal to resume grain exports from Ukraine that is reportedly close to completion but doesn't yet have Putin's explicit backing.
