A woman holds a sign during a protest against candidates for a national unity government proposed by U.N. envoy for Libya Bernardino Leon, in Benghazi, Libya, October 16, 2015. The sign reads: "Brotherhood terrorist group spoilers". REUTERS/Esam Omran Al-Fetori

Western and Arab states issued a joint declaration Monday urging rival sides in Libya to accept UN proposals for a power-sharing government “immediately” to end rampant instability in the country.

The statement was published jointly by the foreign ministers of Algeria, Britain, France, Germany, Italy, Morocco, Qatar, Spain, Tunisia, Turkey, the United Arab Emirates and the United States as well as the EU foreign policy chief.

They “call on all parties in the Libyan political dialogue to immediately adopt the political agreement negotiated by the Special Representative to the United Nations, Mr (Bernardino) Leon,” it reads.

People hold up a placard during a protest against candidates for a national unity government proposed by U.N. envoy for Libya Bernardino Leon, in Benghazi, Libya, October 16, 2015. REUTERS/Esam Omran Al-Fetori
People hold up a placard during a protest against candidates for a national unity government proposed by U.N. envoy for Libya Bernardino Leon, in Benghazi, Libya, October 16, 2015. REUTERS/Esam Omran Al-Fetori

Libya has had two administrations since August 2014, when a militia alliance that includes Islamists overran the capital, forcing the internationally recognised government to take refuge in Tobruk in the east.

UN envoy Leon has put forward proposals for a power-sharing government, but both the internationally recognised parliament and the Islamist-backed assembly have balked at the appointments.

The UN Security Council has threatened to impose sanctions on those who block a peace deal in Libya or undermine any political transition in the country, which descended into chaos after the fall of Moamer Kadhafi in 2011.

The new UN-backed government would be headed by Fayez el-Sarraj, a deputy in the Tripoli parliament, and include three deputy prime ministers, one each from the west, east and south of the country.

A unity government in Libya is seen as the best chance to tackle migrant-smuggling from Libyan territory across the Mediterranean and the rise of the Islamic State group.