Uganda has deployed an unknown number of troops to South Sudan in a bid to protect the fragile government of President Salva Kiir as a tense rivalry with his deputy threatens a return to civil war in the east African nation.

Uganda has deployed special forces in South Sudan's capital Juba to "secure it", Uganda's military chief said on Tuesday, but South Sudan's information minister denied the presence of troops, as tensions between South Sudan's president and first vice president stoke fears of a return to war.

South Sudan's government has denied earlier reports that Uganda had deployed special forces to its capital, Juba. Uganda's military chief Gen Muhoozi Kainerugaba said the soldiers had gone to the neighbouring country to help South Sudanese President Salva Kiir "secure" the city.

Uganda’s ruling National Resistance Movement (NRM) parliamentary caucus has endorsed the deployment of Ugandan troops

The Chief of Defence Forces (CDF) also first son Gen Muhoozi Kainerugaba has said that Uganda has deployed special forces in South Sudan’s capital Juba to “secure it” as tensions between President Salva Kiir and his First Vice President Riek Machar stoke fears of a return to civil war.

The arrests in Juba and deadly clashes around the northern town of Nasir are seen as jeopardizing 2018 peace deal that ended a five-year civil war

South Sudanese and Ugandan lawmakers have expressed concerns over the deployment of Ugandan troops to South Sudan without parliamentary knowledge or approval, citing constitutional and financial implications.

National Resistance Movement (NRM) lawmakers have expressed their support for the deployment of the Uganda People's Defence Force (UPD)F in South Sudan, describing it as a necessary intervention to protect lives, restore stability, and prevent further conflict.

The situation in South Sudan is fragile and getting worse, with growing political and military instability. The claims made by the information minister do not reflect the reality on the ground.