(CNN)The commander of the Kurdish-led Syrian Democratic Forces told a senior US diplomat, "You are leaving us to be slaughtered," demanding to know whether the US is going to do anything to protect Syrian Kurds as Turkey continues its military operation targeting America's Kurdish allies in Syria.

"You have given up on us. You are leaving us to be slaughtered," Gen. Mazloum Kobani Abdi told the Deputy Special Envoy to the Global Coalition to Defeat ISIS, William Roebuck, in a meeting Thursday, according to an internal US government readout that has been obtained exclusively by CNN.

"You are not willing to protect the people, but you do not want another force to come and protect us. You have sold us. This is immoral," Mazloum added.

He insisted the US either help stop the Turkish attack or allow the Syrian Democratic Forces to strike a deal with the Assad regime in Damascus and their Russian backers, allowing Russian warplanes to enforce a no-fly zone over northeast Syria, thereby denying Turkey the ability to carry out airstrikes. The US does not want the Kurds turning to the Russians, administration officials say.