Why convoys cannot fully protect oil tankers from Iran attacks

President Donald Trump has repeatedly urged other global powers to send warships to escort convoys of tankers through the Strait of Hormuz, a vital waterway for the world's oil and liquefied natural gas supplies. Iran has effectively closed the strait since the United States and Israel began a war on the Islamic republic last month, sending global oil prices up by more than 40 percent. Iran has however shown it has a much wider reach and can disrupt supplies throughout the Persian Gulf and beyond...