"China Sea, we strongly affirm and respect the outcome of the case before the permanent court of arbitration as an important contribution to the ongoing efforts to pursue a peaceful resolution and management of our dispute."
Philippine President Rodrigo Duterte declared a unilateral ceasefire with communist guerrillas effectively immediately on Monday and asked the rebels to do the same to end decades of deadly violence and foster the resumption of peace talks.
In his first state of the nation address before Congress, Duterte said he wanted to "end these decades of ambuscades and skirmishes" before the end of his six-year term, which commenced on June 30.
Addressing the New People's Army guerrillas, the ex-city mayor, who built a name for his tough, crime-busting style, also focused on his battle against illegal drugs, threatening drug dealers anew with death.
The decades-long communist insurgency, one of Asia's longest, has left about 150,000 combatants and civilians dead since it broke out in the late 1960s.
It also has stalled economic development, especially in the countryside, where the Maoist insurgents have had an active presence.
Government negotiators have met with rebel counterparts and agreed to restart peace talks soon.