Washington said yesterday it would provide weapons and equipment to the Kurdish People's Protection Units (YPG), which is a key force in the fight against IS in Syria.
"From now on, after this historic arming decision, our units will play a more influential, powerful, and decisive role in fighting terrorism at a faster pace," YPG spokesman Redur Xelil said in a statement.
He said the move had come "somewhat late," but would still "provide a strong impetus" to all forces fighting IS.
The SDF receives air support and training from the US-led coalition and is backed by special advisors on the ground.
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Until yesterday, official US policy was to supply weapons only to the Arab components of the SDF.
"The US decision to arm the YPG... Is important and will hasten the defeat of terrorism," SDF spokesman Talal Sello told AFP.
Sello said the US announcement "is the result of the effectiveness of the YPG and SDF in the fight against terrorism".
"The supply of arms to the YPG is unacceptable," Deputy Prime Minister Nurettin Canikli told A Haber television.
"Such a policy will benefit nobody," he said. "We expect that this mistake is to be rectified."
The SDF has already advanced around much of Raqa and is seeking to encircle the city before launching its full-fledged assault.
The US-led coalition fighting IS has carried out repeated air strikes on Raqa city.
Today, the Britain-based Syrian Observatory for Human Rights monitor said suspected US-led coalition strikes in the city overnight had killed 11 civilians, among them four children.
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