But from 2006, most countries lifted the restrictions on workers from the Czech Republic, Hungary, Slovakia, Slovenia, Latvia, Lithuania, Estonia and Poland.

BBC: EU chides UK over migrant workers from Eastern Europe

Centerra had a brief issue with its Kumtor mine, located in the Kyrgyz republic, when workers went on strike last month.

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From Syria to the Sahel, Yemen to Sudan, the eastern Horn of Africa to the eastern Democratic Republic of Congo, these unarmed aid workers risk their lives to provide life-saving assistance to millions of men, women and children.

WHITEHOUSE: Statement by the Press Secretary on World Humanitarian Day