Vietnam's Prime Minister Pham Minh Chinh expressed a desire to expand international defense cooperation to promote trust and prevent wars. The United States offered to collaborate with Vietnam's defense industry, including joint production and technology transfers. The remarks were made at Vietnam's second international arms fair, which features exhibitors from various countries. Vietnam maintains a 'four no' policy, which includes not participating in military alliances and not allowing foreign military bases. Vietnam is a major importer of weapons and has clashed with China over boundaries in the South China Sea.