As reported by Censor.NET citing Liga, this was announced by the White House spokesperson Josh Earnest at a press conference on Sept. 27.
Earnest said the U.S. might possibly extend sanctions, which have proven to be an efficient instrument of supporting the U.S. interests around the globe.
He also stressed that the sanctions should be implemented jointly with partners to magnify their effect.
The White House spokesperson said the U.S. believed Russia was responsible for the UN humanitarian convoy shelling near Aleppo several days into the Syria cease-fire.
At least 140 people, half of them children, were killed in Aleppo airstrikes by Russian army and Assad's forces over the past weekend.
On Sept. 27, Assad's troops and allies conducted the largest ground offensive of their new military campaign, having attacked the opposition forces in Aleppo.
Related materials: War in Syria