A feud between Turkish President Recep Tayyip Erdogan and U.S.-based Islamic cleric Fethullah Gulen has made sukuk from Asya Katilim Bankasi AS (ASYAB) the worst-performing in the world. Debt from the Shariah-compliant lender known as Bank Asya has lost 29 percent this year, compared with an average 4.5 percent return for dollar-denominated sukuk globally. The government must be clear about what the “problem” with Bank Asya is and decide whether it will take over the lender or impose restrictions on it. The bank, whose shares resumed trading on Turkey’s bourse on Sept. 15 following the five-week long suspension, is planning to raise funds in a capital increase, it said yesterday. The stock slumped 42 percent this week to a record low of 72 kurus at 12:24 p.m. in Istanbul.