Italian Prime Minister Matteo Renzi has warned Libya's factions that time is running out for a national unity government to get the confidence backing it needs from parliament.

Italy and other allies have said they will only intervene militarily to help stabilize Libya and fight the Islamic State group once a national unity government is in place and makes a formal request for international assistance to the United Nations.

With French President Francois Hollande at his side, Renzi told a press conference Tuesday that even with the latest delay of parliamentary approval, the international community still was prepared to do everything to help the government take up its place in Tripoli.

But he warned: "The Libyans must know that the time at their disposition is not infinite."