Syria's Kurds: Turn to Damascus or concede to Turkey?

Syria's most powerful Kurdish group is grappling for friends after its ally, the United States, abandoned it to an invasion by Turkey, whose warplanes, tanks and artillery are raining shells onto its stronghold in the north of the country. The Kurdish fighters have few options. The Turkish military operation, backed by warplanes and a formidable mobilization, has already targeted dozens of locations along a stretch of nearly 200 miles along the Syrian-Turkish border in its opening salvo.