Istanbul (AP) - Turkey begins another military offensive in northern Syria. Turkish President Recep Tayyip Erdogan confirmed the start on Twitter. The aim of the operation is the Kurdish YPG militia, which controls a large area on the Syrian side of the border. Turkey sees in it an offshoot of the banned Kurdish workers' party PKK and understands the members of the militia as terrorists. The invasion follows conflicting US signals. The first had their troops withdrawn from the border region. Then, however, US President Donald Trump partly reversed and threatened Turkey with harsh consequences.