An international court said on Wednesday it would deliver a hotly anticipated ruling in the Philippines' case against China over the South China Sea on July 12, drawing an immediate rebuke from Beijing, which rejects the tribunal's jurisdiction.

The United States, which is a close ally of the Philippines and is concerned about China's expansive South China Sea claims, reiterated its backing for The Hague-based Permanent Court of Arbitration and urged a peaceful resolution of the dispute.

Manila is contesting China's historical claim to about 90 percent of the South China Sea, one of the world's busiest shipping lanes. Several Southeast Asian states have overlapping claims in the sea and the dispute has sparked concerns of a military confrontation that could disrupt global trade.