(VOVworld) – Russian President Vladimir Putin has signed a decree adopting a series of economic measures against Turkey over the downing of a Russian warplane on the Syrian border. The sanctions are “aimed at ensuring national security and that of Russian citizens” and included a ban on charter flights between the two countries and on Russian businesses hiring any new Turkish nationals as well as import restrictions on certain Turkish goods. The new measures, which will come into effect from 1 January, end a visa-free travel between Russia and Turkey. In addition, Turkish airlines will have to undergo increased controls in Russia “for security reasons”. The decree also imposes measures reinforcing the security of ports on the Black Sea and the Sea of Azov, and redoubles inspections of Turkish trucking companies.