https://cdnph.upi.com/ph/st/th/4941776948747/2026/i/17769491822301/v1.5/Woori-Bank-signs-memo-to-work-with-Vietnams-Viettel-Group.jpg" /> South Korea's Woori Bank said it signed a memorandum of understanding with Viettel Global, an affiliate of Vietnamese mobile carrier Viettel Group.