No friends, no enemies? Trans-Atlantic relations after Trump’s Europe trip
Who won Turkey? Implications from Erdoğan’s snap elections
Turkey, Europe, and the U.S.: New challenges and changing dynamics
Both the executive and legislative branches have exhausted their strategic patience [with Turkey].
Although it is unlikely the sanctions will have much practical effect in either case, it is significant and unprecedented that two NATO allies have sanctioned members of each other's government.
Trump will not back down until Brunson is home, while Erdogan does not want to look like he capitulated to the Americans.