KUALA LUMPUR, April 22 (Reuters) - Malaysia has issued $800 million 10-year trust certificates, world’s first sovereign U.S. dollar sustainability sukuk, the finance ministry said on Thursday. In addition, the Southeast Asian nation also issued $500 million 30-year trust certificates, the ministry said in a statement. Malaysia upsized the sukuk offering from initial target size of $1.0 billion to $1.3 billion due to overwhelming demand as oversubscription hit 6.4 times. (Reporting by Liz Lee Editing by Shri Navaratnam)