Hello, this is Justina Lee writing to you from Singapore. Welcome to another edition of CNBC's Daily Open. Markets are once again keeping a close eye on renewed tensions in the Middle East, which could push oil prices higher. Reports that Iran attacked a cargo ship in the Strait of Hormuz, the prospect of another major oil producer leaving OPEC and fresh disagreements between Tehran and Washington have revived concerns about energy supplies. Investors, meanwhile, are parsing an increasingly