A new conversation with strategic perspective, realistic goals and achievable outcomes needs to be restarted between Turkey and the U.S.

Last week, one of the most significant developments in regards to Turkish-American relations was the meeting of U.S. President Donald Trump with dozens of Republican senators. Reportedly, during the meeting President Trump tried to convince the senators in regards to the potential negative impacts of adopting sanctions against Turkey to the U.S. and its bilateral relations.

The S-400 air defense system's delivery to Turkey has sparked debate among Western governments on Ankara's future treatment. The question at hand goes beyond concerns about the fate of Turkey-U.S. relations. This is much bigger than one key NATO ally removing another key ally from the joint F-35 fighter jet program.

The Pentagon removed Turkey from the F-35 fighter jet program, despite U.S. President Donald Trump's earlier comments about Ankara being treated unfairly over its move to purchase the S-400 missile defense system from Russia. That Congress favored Turkey's removal was no secret either. It remains to be seen whether the United States will levy sanctions on Turkey under the Countering America's Adversaries Through Sanctions Act (CAATSA).

The ups and downs in Turkey-U.S. relations in the last two decades have generated a paradoxical situation for scholars and observers alike.

Ankara's confrontation with Washington on the delivery of the Russian-made S-400 air defense system has been one of Turkey's top foreign policy issues in the last several months.

Pesident Recep Tayyip Erdoğan's bilateral meeting with U.S. President Donald Trump in Osaka, Japan marked a new chapter in the S-400 dispute. A textbook example of leader-to-leader diplomacy, that meeting paved the way for Trump lending support to the Turkish position on Patriot missiles, the Russian air defense system and the F-35 jet fighter program.

With the S-400 missile defense system's delivery around the corner, tensions are escalating between Turkey and the United States. The Turks are committed to buying the Russian system despite Washington's threats. The Pentagon's most recent letter to Defense Minister Hulusi Akar, which included a long list of threats, did not change Ankara's mind either.

The United States took its first 'concrete step' to encourage Turkey to rethink its plan to purchase the S-400 missile defense system from Russia. Washington was going to exclude Turkish pilots from the F-35 fighter jet training program, Reuters reported last week.

Turkey has a very busy agenda ahead of itself for the month of June..

The Trump administration is using sanctions, mostly economic sanctions, more aggressively compared to earlier administrations. Last summer, Washington imposed national security sanctions on Turkish steel and aluminum due to the detention of pastor Andrew Brunson in Turkey.

Earlier this week, senior Turkish officials visited the U.S. capital to prevent further deterioration of bilateral relations. Treasury and Finance Minister Berat Albayrak, Defense Minister Hulusi Akar, Trade Minister Ruhsar Pekcan and Presidential Spokesman Ibrahim Kalın shared Turkey's perspective with their counterparts.

It is becoming more and more apparent that the relationship with the U.S. will dominate our foreign policy agenda in the upcoming years. This issue is not only limited to the widening rift in bilateral relations over the recent period but essentially related to the changing strategic calculations of Washington and Ankara.

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.

New developments fuel tensions between Washington and Ankara. Despite U.S. President Donald Trump's promises to President Recep Tayyip Erdoğan over the phone, no problem has yet gone away. Quite the contrary, the foreign policy establishment and Congress continue to try and undermine bilateral relations.

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.

On the condition that both sides engage in sincere negotiations, Ankara-Washington relations can easily get back on track again in a very short period of time