More than two years of talks to end decades of civil war in the nation's rugged borderlands have gained momentum in recent weeks, with the government eager to reach a deal before November's general election.
But hopes for a nationwide ceasefire have crumbled after several rebel groups refused to sign an agreement without the inclusion of all insurgent forces -- notably some smaller organisations locked in conflict with the army.
"We will keep inviting all ethnic armed groups to sign," he said, referring to the 15 rebel organisations the government has agreed to negotiate with.
Major groups including the Kachin Independence Army have refused to sign the agreement, and clashes between them and government troops have intensified in recent weeks as the negotiations reach a critical juncture.
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On Saturday a confederation of ethnic armed groups urged the international community to support efforts for "genuine political dialogue and peace" in Myanmar.
Myanmar's government had agreed to allow 15 ethnic armed groups to sign the deal, but rejected some half a dozen organisations put forward by a consortium of ethnic minority armies seeking full inclusion in the ceasefire.
At a meeting between some ethnic armed groups and government officials at the Myanmar Peace Centre in Yangon earlier today, chief government peace negotiator Aung Min said the army "had no intention to launch an offensive against these groups because they didn't sign the NCA".
Aung Min added that the government "accepts all-inclusiveness in principle" and would seek ways in which other groups could take part.
The ceasefire deal will be signed in the presence of local and international witnesses, according to Hla Maung Shwe.