The purpose of INS Kirpan's sail to Vietnam from Visakhapatnam is to strengthen India's ties with Vietnam and enhance maritime cooperation between the two countries. Here are the key points regarding the purpose of this sail:

• Enhancing bilateral relations: The sail aims to strengthen the existing ties between India and Vietnam, which have been steadily developing in recent years.
• Maritime cooperation: By sailing INS Kirpan to Vietnam, India aims to enhance cooperation in the maritime domain. This includes joint exercises, training, and sharing of best practices in areas such as naval technology and anti-piracy operations.
• Geopolitical strategy: The sail also reflects India's broader strategy to strengthen its influence in the Indo-Pacific region and counterbalance the growing influence of other regional powers.
• Strategic partnership: India and Vietnam have a strategic partnership that encompasses various areas of cooperation, including defense and security. The sail of INS Kirpan further emphasizes the importance of this partnership.

Overall, INS Kirpan's sail to Vietnam is part of India's efforts to deepen its engagement with Vietnam and enhance maritime cooperation between the two countries.