By Jonathan Saul and Anna HirtensteinMarch 5 (Reuters) - More tankers came under attack in Gulf waters on Thursday as the U.S.–Iran war escalated, and Iranian drones entered Azerbaijan, threatening to spread the crisis to more oil producers in the region. A Bahamas-flagged crude oil tanker was targeted by an Iranian remote-controlled boat laden with explosives while anchored near Iraq's Khor al Zubair port, according to initial assessments. A second tanker at anchor off Kuwait was taking on...