"Frightening" food shortages caused by Russia's blockade of Ukraine's port city of Odesa could lead to the break down of law and order in dozens of countries unless Vladimir Putin is stopped.
David Beasley, who heads the UN World Food Programme, told a conference in Addis Ababa Thursday that "frightening" food shortages are looming.
The official fears countries feeding their citizens on wheat exports from Ukraine and Russia will be hardest hit.
