Former South Sudan rebel leader Riek Machar was on Tuesday sworn in as the country's first Vice President.
Mr Machar fled the country in 2013 as differences between him and President Salva Kiir Mayardit escalated.
Supremacy battles between the former Sudanese People's Liberation Movement fighters led to the sacking of the entire Cabinet by President Salva Kiir including SPLM Secretary General Pagan Amum.
Machar's swearing in is expected to return Africa's youngest nation to stability.
Over 200,000 Southern Sudanese have been displaced since 2013 as Machar's rebels clashed with government forces.
Machar's return home was postponed for days following his protest that a plane that was to airlift him had not been cleared to land at Juba Airport.
United Nations Development Programme communications consultant Janet Maya told this writer from Juba on Tuesday that tension was high before Machar's plane landed.
"The transitional government of national unity will now be formed," she said.
Machar, before his sacking had accused President Kiir of being high-handed in managing government.
He waged rebellion against Kiir alongside former first lady Rebecca Nyandeng' Garang wife to the country's first President, the late John Garang de Mabior.