European and Iranian diplomats fail to agree on how to avoid reimposing U.N. sanctions

VIENNA — Representatives of three European countries threatening to reimpose U.N. sanctions on Iran over its nuclear program failed to agree with their Iranian counterpart on Tuesday on how to avoid the measures days ahead of a deadline, a diplomat said. The diplomat said efforts would continue to search for a solution ahead of an E3 deadline at the end of this month to invoke the so-called “snapback mechanism” of the 2015 Iran nuclear deal over what the countries have deemed