French foreign minister Catherine Colonna has urged Iran to take the last offer on the table to revive the 2015 nuclear deal with the United States and key powers, saying the window of opportunity “is about to close.” Failure in the nuclear negotiations could raise the risk of a fresh regional war, with Israel threatening military action against Iran if diplomacy fails to prevent Tehran from developing a nuclear weapons capability. In a wide-ranging press conference on the sidelines of this week’s gathering of world leaders at the U.N. General Assembly, Catherine Colonna also accused Russia of…