Norway's foreign minister says the international community will seriously consider sanctions on South Sudan's warring factions if they don't reach a power sharing agreement this week.

Borge Brende, who's attending an African Union Executive Council meeting in Addis Ababa, said late Monday warring factions in South Sudan are expected to reach an agreement in peace talks planned alongside the A.U. summit in Ethiopia on Jan. 29.

Brende's statement comes days after the U.S., U.K. and Norway said in a joint statement they are gravely concerned with the lack of progress in the South Sudan peace negotiations.

Fighting broke out December 2013 between South Sudan President Salva Kiir's troops and those loyal to Riek Machar, Kiir's former vice president. Since then, more than 1.5 million South Sudanese have fled their homes.