Defense Secretary Chuck Hagel, meeting this week with U.S. allies at a NATO summit in Wales, will discuss the potential stand-up of a new, rapid-response force in Eastern Europe to counter Russian military provocations in and around Ukraine, as well as solicit assistance for combating militant extremists in Iraq, according to Rear Adm. John Kirby, the Pentagon's top spokesman. "I think we would certainly participate in any discussion about the development of this rapid reaction force," Kirby told reporters at...