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President Trump and Turkish President Recep Tayyip Erdogan the 2018 NATO Summit in Brussels, Belgium. Photo: Sean Gallup/Getty Images

The U.S. will block Turkey from purchasing F-35 aircraft and halt the training of Turkish military pilots, the AP reports. The move comes in response to Turkey's plan to buy an advanced Russian S-400 missile defense system.

Our thought bubble, per Axios' Dave Lawler: Turkey is a NATO ally, but relations with the U.S. have deteriorated sharply amid conflicts on a variety of issues, including Syria. Prime Minister Recep Tayyip Erdogan has hedged his bets by growing closer to Moscow, and antagonized Washington in the process. This relationship is on increasingly shaky ground.

Details: Turkish pilots will no longer be trained after July 31, according to a letter from acting Defense Secretary Patrick Shanahan. All Turkish personnel involved in the program will also have to leave the U.S. by the end of July.

The backdrop: The U.S. has exerted pressure in recent months over the purchase of the Russian missile system, which is incompatible with NATO systems, but Erdogan has remained defiant. Shanahan laid out some of the consequences of that decision in his letter:

“In addition to threatening the security of platforms like the F-35, Turkey’s procurement of the S-400 will hinder your nation’s ability to enhance or maintain cooperation with the United States and within NATO, lead to Turkish strategic and economic over-dependence on Russia, and undermine Turkey’s very capable defense industry and ambitious economic development goals."

Go deeper: Turkey defiant in face of U.S. pressure over Russian missile system

Go deeper

29 mins ago - World

Biden huddles with European allies on Ukraine ahead of Putin call

Putin in the Kremlin. Photo: Grigory Sysoyev/Sputnik via Getty

President Biden will seek to convince Russia's Vladimir Putin in a phone call Tuesday that the price of invading Ukraine would be steeper than anything he's faced in the past.

Driving the news: Biden held a call on Ukraine this evening with the leaders of France, Germany, Italy and the U.K., while Secretary of State Tony Blinken called Ukrainian President Volodymyr Zelensky to offer America's "unwavering support."

Justice Department closes Emmett Till murder probe

A faded photograph is attached to the headstone that marks the gravesite of Emmett Till in Burr Oak Cemetery in Chicago. Photo: Scott Olson via Getty Images

The family of Emmett Till announced Monday that the Department of Justice has formally closed its second investigation into the 1955 murder of Emmett Till.

Why it matters: The DOJ reopened the probe in 2018 after the white woman at the center of the case reportedly recanted her allegation that Till, a Black 14-year-old, sexually harassed her prior to his murder.

GOP Rep. Devin Nunes to retire, will be CEO of Trump media org

Rep. Devin Nunes. Photo: Dylan Hollingsworth/Bloomberg via Getty Images

Rep. Devin Nunes (R-Calif.), who serves as the top Republican on the House Intelligence Committee, will retire at the end of the year and become CEO of Trump's new media organization.

Why it matters: Nunes, once considered a moderate member of the party, became one of the fiercest defenders of former President Donald Trump throughout both of Trump's impeachments and the Intel committee's Russia investigation.