The peace talks were held in Minsk and involved officials from Ukraine and Russia, Russian-backed separatist leaders from the self-proclaimed Donetsk and Luhansk People's Republics, and the OSCE.
According to a source who spoke with Interfax-Ukraine about the agreement, "The protocol consists of 14 clauses which include all the aspects of monitoring, the exchange of prisoners and other issues."
Ukrainian President Petro Poroshenko confirmed the signing of a cease-fire agreement in a Twitter post.
Віддаю наказ начальнику Генерального штабу Збройних Сил України припинити вогонь починаючи з 18.00 5 вересня. pic.twitter.com/zb58uuEbVg— Петро Порошенко (@poroshenko) September 5, 2014
Poroshenko issued a statement that in response to "a call for ceasefire of President of Russia Vladimir Putin addressed to the heads of illegal armed groups of the Donbas and the signature of the protocol at the meeting of Trilateral contact group on the implementation of the Peace plan of the President of Ukraine, I order the Chief of the General Staff of the Armed Forces of Ukraine to cease fire starting from 18:00, September 5."
"I also instruct the Minister of Foreign Affairs of Ukraine to ensure jointly with the OSCE an efficient international control over the compliance with the ceasefire regime which must be exclusively bilateral."
Pro-Russian rebel leader Igor Plotnitsky from Luhansk acknowledged that while "Most of the points of the protocol correspond with our demands," the separatists are not abandoning plans to join Russia; "the cease-fire does not mean a shift from our course of breaking away from Ukraine."