Hmmm,
Turkey probably threatened to send more immigrants or organize pro-Erdogan Muslim brotherhood political marches throughout Germany.
In a planned effort to get Germany to stop arms sales and reduce Saudi effectiveness in Yemen. Allowing Iran and Turkey to more easily encircle Saudi Arabia with shiite backed governments.
The U.S. on the other hand continues to sell arms to Saudi Kingdom. Though I dont think because we like them but because as I stated earlier we have common concerns about Turkey and Iran.