Turkish President Recep Tayyip Erdogan warned Russia on Friday not to "play with fire," citing reports that Turkish businessmen had been detained in Russia. Moscow said it would suspend visa-free travel with Turkey.
Relations between the former Cold War antagonists are at their lowest in recent memory after Turkey shot down a Russian jet near the Syrian border on Tuesday. Russia has threatened economic retaliation, a response Erdogan has dismissed as emotional and indecorous.
The incident has proved a distraction for the West, which is looking to build support for the U.S.-led fight against Islamic State in Syria. The nearly 5-year-old Syrian civil war has been complicated by Russian airstrikes in defense of President Bashar Assad.