When it comes to tackling migration, climate change or seemingly intractable conflicts, the doctrine of collective responsibility, embodied by the UN, is the only way forward, according to Deputy Secretary-General Amina Mohammed.

She spoke to Conor Lennon, in the UN’s VIP Social Media Studio – where dozens of world leaders have been taking part in Facebook Live interviews during High-Level week – who asked her what should be done to strengthen multilateralism.