A speech by Prime Minister Shinzo Abe on Wednesday omitted key wording previous Japanese leaders have used in referring to Japan's actions before and during World War II, fueling speculation he will deliver a watered-down statement in August to mark 70 years since the war's end.

As the war remains sensitive for nations such as China and South Korea — both of which suffered from Japan's aggression and colonial rule — any weakening of language in the upcoming statement appears certain to spark renewed criticism of Tokyo and make reconciliation with the neighbors increasingly difficult, analysts say.

Abe's address to Asian and African leaders gathered in Jakarta on Wednesday was seen as a prelude to the statement planned for August. He expressed "deep remorse" over the war but did not offer a "heartfelt apology" to the people of Asian nations affected by Japan's "colonial rule and aggression."