The U.S. must be "very transparent" in light of reports indicating that Russia was responsible for an air strike on an aid convoy that killed about 20 people in Syria, California Democratic Sen. Dianne Feinstein said Tuesday.
"The proper U.S. response is to be very transparent and point out, 'Did we alert the Russians before the attack what we were going to attack?" Feinstein, a member of Senate Intelligence Committee, told Wolf Blitzer on CNN. "The Russians knew before we attacked.
"If we're going to work together and one side is making a mistake and the other side knows it, they ought to say: 'Be careful. This isn't what you think it is.'"
U.S. officials said that they believe Russia was responsible for the airstrike, according to news reports.
Two Russian SU-24 warplanes were operating in the area where the aid convoy was struck in the Aleppo region late Monday, the official said.
"The best evaluation we have is that the Russians carried out the strike," the official added, speaking on condition of anonymity.
The United Nations said that at least 18 trucks in a 31-vehicle convoy were destroyed as they delivered humanitarian assistance to Orum al-Kubra.
Russia has vigorously denied that it conducted the attack, and Syrian officials have also their country was not involved.
"There is a lot still to be known about how these attacks happened, why they happened and whether deconfliction will happen," Feinstein said.