Nearly two million people have fled Venezuela's economic and political crisis since 2015, according to the UN which called for a "non-political" response to an exodus that is straining regional resources.

"Some 5,000 people are now leaving Venezuela daily – the largest population movement in Latin America's recent history," UN refugee agency (UNHCR) chief Filippo Grandi told the organisation's executive committee on Monday.

"A non-political and humanitarian approach is essential to help states receiving them in growing numbers," he added.