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).

After months of deliberations, Turkey began to take delivery of the Russian S-400 missile defense system last week.

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

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.

The leader-to-leader diplomacy between the U.S. and Turkey at the G20 summit was crucial in defusing the S-400 dispute and turned it into a potential communication tool for bilateral ties

Since the beginning of Trump's presidency, the two leaders have pretty regularly communicated with each other in face-to-face meetings or through phone calls. This has been an important factor in determining bilateral ties in the last two-and-a-half years.

A few weeks ago, this column detailed how, in the last two decades, U.S. administrations have periodically made war plans and debated conflict scenarios. Both the George W. Bush and Barack Obama administrations did it, and now the Donald Trump administration has come to a similar point of deliberating a military response against Iran.

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..

Within the framework of a shift in global economic gravity, Chinese assertiveness and political-military vision regarding East Asia is creating heated debates with U.S. representatives at international summits

Nowadays, it has become commonplace among foreign policy scholars to debate the future of Turkish-American relations.

The growing tension between the U.S. and Iran is in the spotlight in our region. Washington is approaching Iran with a policy of "maximum pressure." They have not only strengthened the sanctions but also sent an aircraft carrier to the Gulf.

It is now almost a ritual of U.S. administrations to escalate tension with Iran. At least in the last three administrations we have seen similar forms of escalations between the two countries. During the Bush administration, Iran became part of the axis of evil and there were speculations and rumors that if things do not go so terribly in Iraq the next target will be Iran.

Tensions between the United States and Iran have escalated dangerously over the past week. Although both sides deny that war is imminent, a violent confrontation grows more likely with every passing day.

The Donald Trump administration continues to use American power crudely every day. Washington not only continues to dismantle the post-World War II liberal order, an American creation, but has also imposed its unilateral national interest on the international arena and its actors.