"This large scale deployment underlines how we are stepping up our global commitments," Fallon told a conference of defense ministers.
"Backed by a rising defense budget, it`s part of our effort to tackle the instability that leads to mass migration and terrorism. It will help keep Britain safe while improving lives abroad."
Last month, the United Nations Security Council authorized the deployment of 4,000-strong protection force in South Sudan`s capital Juba after several days of fighting involving tanks and helicopters between troops loyal to President Salva Kiir and those backing former Vice President Riek Machar.
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