Uganda is facing the world's fastest growing refugee crisis as South Sudanese pour over the border to escape more than three years of civil war in their country.
UN Secretary General Antonio Guterres is visiting a refugee settlement today, before joining other top officials, donors and regional leaders for the Refugee Solidarity Summit in Kampala on Friday.
The summit aims to raise USD 2 billion for the coming year, however organisers say USD 8 billion is needed to deal with the crisis for the coming four years.
"Uganda's example of helping vulnerable people cope with displacement is an example for the whole region and the world. However no country can deal with such a high number of refugees on its own," said Stylianides.
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According to the UN refugee agency more than 947,000 South Sudanese refugees are sheltering in Uganda, bringing the total number of refugees in the east African nation to more than 1.2 million.
An August 2015 peace deal was left in tatters when fighting broke out in Juba in July last year, spreading violence across the country.
It was this outbreak of fighting that led to the biggest exodus, with some 743,000 South Sudanese arriving in Uganda since July 2016, about 2,000 a day.
More than 270,000 are housed in Bidibidi settlement, which overtook Kenya's Dadaab earlier this year as the biggest refugee camp in the world.