South Sudan: What we know about the complex crisis

South Sudan's opposition leader Riek Machar (L) arrives for the third round of Sudanese peace talks in Juba, South Sudan, on December 10, 2019.[AFP]

Recent clashes between forces loyal to President Salva Kiir and First Vice President Riek Machar have raised fears that South Sudan is on the brink of renewed war.

The arrest of Machar last week was seen by some observers as the spark that could reignite the civil war that the rivals fought between 2013 and 2018 that killed some 400,000 people.