The Foreign Minister of Syria on Saturday demanded the withdrawal of all US and Turkish troops, warning that the Syrian government was entitled to take "counter-measures" if they remained.
Valid al-Moal made a request for a statement at the UN General Assembly on Saturday.
There are about 1,000 American soldiers in Syria fighting with Islamic State fighters. Turkey has forces in Syria targeting IDIS and Kurdish fighters.
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"US and Turkey maintain illegal military presence in northern Syria." Al Molelem told the US General Assembly on Saturday. "All foreign forces operating in our territories without our permission are occupying forces and must be withdrawn immediately.
" If they refuse, we have the right to take any and all counter-measures permitted under international law, "he says
For more than eight years, the devastating civil war in Syria has drawn many foreign troops and thousands of foreign fighters fighting for power.
Most of the country has returned to government control, but rebels and extremes the East still hold Idlib in the northwest and the oil-rich northeast, held by US-backed Kurdish groups.
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Last year, President Trump ordered the full withdrawal of US troops from Syria – but then agreed to let some forces remain to ensure that ISIS fighters cannot regroup, Reuters reported.  The Associated Press contributed to this report.