Israeli Prime Minister Benjamin Netanyahu has told citizens in Israel to be ready for “challenging days” ahead, following a dramatic escalation of tensions with Iran and Hamas. “We are prepared for every scenario and will stand united against all threats,” Netanyahu said after a meeting of the Israeli security cabinet at military headquarters in Tel Aviv. “Israel will exact a high price for any aggression against us, from any front,” he said. He was speaking after the assassination of Hamas leader Ismail Haniyeh in Tehran. Iran and Hamas blame Israel for the strike and have threatened Israel w…