U.S. Secretary of State John Kerry speaks during a news conference in TunisWashington has to “exhaust all remedies” before contemplating military action to force Tehran to cease nuclear activities, Kerry says. The United States has an obligation to pursue nuclear negotiations with Iran before it considers going to war with Tehran to force it to give up its nuclear activities, US Secretary of State John Kerry said on Wednesday. “We took the initiative and led the effort to try to figure out if before we go to war there actually might be a peaceful solution,” Kerry told a group of reporters. Iran reached a landmark preliminary agreement with six world powers, including the United States, in November to halt its most sensitive nuclear operations, winning some relief from economic sanctions in return. US President Barack Obama, like his predecessors, has said that all options are on the table with regard to Iran’s nuclear program, using diplomatic code for the possibility of military action. While US officials have long held out that threat, Kerry’s comments appeared to indicate that the Obama administration would seriously consider a strike on Iran if the diplomatic talks fail. More