World leaders mark WWI centenary in Belgium's Liege
World leaders marked the 100th anniversary of the outbreak of World War I on Monday throughout Europe warning of lessons to be learned in the face of today's many crises, including Ukraine. Duration: 00:36
World leaders marked the 100th anniversary of the outbreak of World War I on Monday throughout Europe warning of lessons to be learned in the face of today's many crises, including Ukraine. Duration: 00:36