US Secretary of State Antony Blinken on Wednesday warned NATO ally Turkey against a military offensive in Syria, saying it would put the region at risk. Blinken urged Turkey to stick to cease-fire lines established in 2019 after President Recep Tayyip Erdogan renewed threats to “clean up” two northern Syrian cities of Kurdish fighters. “It’s something that we would oppose,” Blinken told a joint news conference with NATO Secretary-General Jens Stoltenberg. “The concern that we have is that any new offensive would undermine regional stability (and) provide malign actors with opportunities to exp…