Speaking at a news conference with his Polish and Romanian counterparts, Foreign Minister Mevlut Cavusoglu said Turkey is taking the utmost care to ensure that the S-400 system is under full Turkish control.
How Trump won his first fake emergency.
US Army General Joseph Votel, head of the US Central Command, cautioned that the exact timing would depend on the situation in Syria.
The latest additions will bring the total number of active-duty troops on the US border to 4,350.
Trump has undermined what's left of Iraq's sovereignty, but are those who cry wolf over it any different?
The Taliban in Afghanistan refused to hold formal talks with the Western-backed Afghan government during peace talks planned to take place in Saudi Arabia next month.
Despite the falling out, the Pentagon says that outgoing Defense Secretary Mattis authorised Trump's withdrawal of US forces from Syria, one of the decisions that helped trigger his resignation.
Turkish Presidential spokesman Ibrahim Kalin says a US military delegation is visiting Turkey to discuss US President Donald Trump's announcement of plans to withdraw roughly 2,000 US troops from Syria.
The move comes three days after Jim Mattis resigned over Trump's less interventionist policy in the Middle East.
Jim Mattis departure had been anticipated after President Donald Trump announced that he was withdrawing US troops from Syria despite opposition from Washington's allies and top US military officials.
Senior officials of US President Trump's cabinet appeared before Senate ahead of a planned vote on reducing military assistance to Riyadh, blamed for high civilian death rates in Yemen and the murder of journalist Jamal Khashoggi.
Erik Prince, a former US Navy SEAL whose sister Betsy De Vos serves as Education Secretary in the Trump administration, has been lobbying officials about his proposal to privatise parts of US military operations in Afghanistan for more than a year.
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