Cranes at a port in eastern Ukraine. Ukraine is one of the world's top grain exporters, loading container ships that carry 12 per cent of the world's wheat supply and 16 per cent of its corn. AP
Cranes at a port in eastern Ukraine. Ukraine is one of the world's top grain exporters, loading container ships that carry 12 per cent of the world's wheat supply and 16 per cent of its corn. AP

Russia-Ukraine crisis disrupts trade on crucial shipping route