China said on Tuesday it had lodged an official complaint with Myanmar after two soldiers illegally crossed the border into southwest China and shot dead a local resident earlier this year.
It was the first time Beijing has commented on the January 12 incident along the China-Myanmar border in Yunnan.
Chinese state-run media had made no previous mention of the shooting and it was not clear why Beijing - a key ally and major investor in Myanmar - had remained tight-lipped about the incident until now.
"The Chinese side lodged solemn representations with the Myanmar side, asking it to find out the truth, punish the perpetrators and compensate the bereaved families," foreign ministry spokesman Liu Weimin told a regular briefing.
"The Myanmar side said it paid attention to the representations and is stepping up investigations."
Kachin News, a Thailand-based website, had reported in January that Lahpai Zau Lawn, 53, was shot at close range in the abdomen and twice in the head.