Prime Minister Benjamin Netanyahu on Tuesday sent an apparent message to Hezbollah leader Hassan Nasrallah, warning, "Our enemies should know that we will aggressively retaliate to any attack against us."Netanyahu made the comments at an awards ceremony for outstanding Mossad employees just two days after Nasrallah warned Israel that Hezbollah would retaliate for the assassination of its operative Samir Kuntar. Kuntar was killed in a missile attack in a Damascus suburb last week that Hezbollah has accused Israel of perpetrating.Netanyahu discussed the changing role of the Mossad amid new threats facing Israel."Because of the rise of extremist Islam, we find ourselves...in a world war against two large factions of extremist Islam which spread across the globe," he said, in reference to Sunni extremist groups such as ISIS and Shi'ite extremist groups such as Hezbollah and its patron Iran."We are obligated to deal with these threats," the prime minister stated. "These two threats are linked to one another."