Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. US Defense Secretary Blasts Erdogan for 'Unnecessary' Syria Incursion VOA News Ken Bredemeier contributed to this report. U.S. Defense Secretary Mark Esper says Turkish President Recep Tayyip Erdogan "bears full responsibility" for the resurgence of Islamic State, a growing humanitarian crisis, and possible war crimes. This was the Pentagon's strongest condemnation so far of Turkey's military operation against Kurdish fighters in northern Syria. Esper calls Turkey's attacks on the Kurds "unnecessary and impulsive." He says it has undermined what he calls the "successful" multinational mission to defeat Islamic State in Syria by allowing "many dangerous ISIS detainees" to flee detention camps that had been guarded by the Kurds. .