Turkey's decision to purchase Russian S-400 air defense system has become a major sticking point with the U.S. While Turkey attaches great importance to procuring the air defense system, U.S. policymakers, who consider Turkey's decision a complete deviation from its traditional alliance system, have begun to threaten the country.
The United States mounts pressure on Turkey over its decision to purchase the S-400 air defense system from Russia. The Turks already told Washington that the S-400 purchase was a done deal, yet U.S. officials keep trying.
The Syrian crisis entered a new phase following Turkish intervention. Turkey has already demonstrated its determination not to negotiate the positions of actors that pose a vital threat to Turkish national security and territorial integrity.
As the international system changes and rising powers challenge U.S. predominance around the world, the direction of Washington's foreign policy will be extremely important in shaping future geopolitics