Best of WION Global Summit: Leaders who matter

What are the biggest challenges in the 21st century? WION's Executive Editor Palki Sharma Upadhyay discusses with: Dr Vaira Vīķe-Freiberga, Former President, Latvia Mariya Didi, Defence Minister, Maldives Ranil Wickremesinghe, Former Prime Minister, Sri Lanka David Steward, Former South African Ambassador to the UN