The US has called for an end to fighting between Syrian rebels backed by Turkey and Kurdish-led forces as clashes between its allies threatens to upend Washington’s military plans in northern Syria.
Rebel groups supported by Turkey, a Nato ally, pushed farther south into Syria on Monday, bringing them into conflict with forces largely made up of Syrian Kurds that have been backed by the Pentagon.
The fighting underlined the sometimes precarious position of the US, which is supporting several proxies in different parts of the Syrian conflict and is trying to balance its alliance with Turkey with its support for Kurds, which have been one of the most effective forces against Isis.
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