Singapore's outgoing defence minister, Ng Eng Hen, says it is unrealistic to expect the island-state to change the world amid rising geopolitical tensions. But it can contribute by staying relevant as an honest, sensitive and respectful voice. Dr Ng is stepping down after 24 years in politics. In a wide-ranging interview with local media, he also has some advice for the country's next generation of leaders. Jeraldine Yap with more.