A weekly digest of national security, defense, and cybersecurity news from Foreign Policy reporters Jack Detsch and Robbie Gramer, formerly Security Brief. Delivered Thursday.\What’s on tap: A tentative agreement between the Taliban and the United States faces new roadblocks as new violence rocks Kabul, a weakened Islamic States is using cows as suicide bombers, Erdogan issues migrant threat to spur progress on Syria safe zone.Afghan Peace Talks FalterPompeo won’t sign. Efforts to broker a peace deal between the Taliban and the U.S. government is running into headwinds in both Kabul and...…A weekly digest of national security, defense, and cybersecurity news from Foreign Policy reporters Jack Detsch and Robbie Gramer, formerly Security Brief. Delivered Thursday.\What’s on tap: A tentative agreement between the Taliban and the United States faces new roadblocks as new violence rocks Kabul, a weakened Islamic States is using cows as suicide bombers, Erdogan issues migrant threat to spur progress on Syria safe zone.Afghan Peace Talks FalterPompeo won’t sign. Efforts to broker a peace deal between the Taliban and the U.S. government is running into headwinds in both Kabul and...WW…