Representatives of Myanmar's ethnic minorities who have been battling the government for decades say a meeting with Aung San Suu Kyi, the country's de facto leader, was a good beginning but that the peace process remains an uphill task.

Khu Oo Reh of the United Nationalities Federal Council, a coalition of ethnic rebel groups, said Monday that neither side made any promises in the talks to prepare the ground for substantive peace negotiations in August.

He said there had been discussion but no agreement at the Sunday talks over whether ethnic armed groups who didn't sign a 2015 nationwide ceasefire agreement would participate in the August meeting, considered by both sides to be crucial to restoring peace after more than five decades of mutual mistrust and warfare.