The US says it is unclear what the intentions are behind Russia's continued military buildup in Syria.
As the Obama administration repeated its position that it wants Russia to join the U.S. and partners in the fight against ISIS, it once again condemned any support given by Moscow to the Assad regime.
On Monday the US State department said it was unable to verify a Reuters news agency report that Russia had begun flying drone surveillance missions in Syria.
Spokesperson John Kirby said military communication between the US and Russia was still needed to address concerns over Syria...
IN: The fact that...'
OUT: '...ask them
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