BANGKOK/PHNOM PENH (Reuters) -- Cambodia said on Sunday it had asked the International Court of Justice to resolve its border disputes with Thailand, after a flare-up in their long-running row led the Southeast Asian neighbors to mobilize troops on both sides of the border. A Cambodian soldier was killed in a brief skirmish on May 28 in a confrontation over the 820-km (510-mile) frontier, parts of which are undemarcated and claimed by both nations.