Russia announced Friday that it will suspend visa-free travel with Turkey amid the escalating spat over the downing of a Russian warplane by a Turkish fighter jet at the Syrian border.

Russian Foreign Minister Sergey Lavrov announced that Moscow will halt the existing visa-free regime starting Jan. 1, saying that Turkey has become a conduit for terrorists and has been reluctant to share information with Moscow about Russian citizens accused of involvement in terrorist activities.

Turkey’s downing of the Russian military jet Tuesday, the first time in half a century that a NATO member shot down a Russian plane, has drawn a harsh response from Moscow. Russia has since restricted tourist travel, left Turkish trucks stranded at the border, confiscated large quantities of Turkish food imports and started preparing a raft of broader economic sanctions.

President Vladimir Putin has also ordered the deployment of the long-range S-400 air defense missile systems to a Russian air base in Syria just 50 kilometers (30 miles) south of the border with Turkey to help protect Russian warplanes, and the Russian military warned it would shoot down any aerial target that would pose a potential threat to its planes. The military also moved the missile cruiser Moskva closer to the shore to help cover Russian bombers om combat missions.