Japanese Prime Minister Shinzo Abe and Philippine President Benigno Aquino will jointly address the media following their meeting in Tokyo, at which they are expected to affirm their commitment to ensuring maritime security in the South China Sea.
Aquino has passionately courted Japan, along with the United States, to help serve as a counterbalance to China's claims to almost the entirety of the sea, a major global shipping route believed to be home to oil and gas reserves.
Aquino yesterday sparked ire in Beijing by comparing it with Nazi Germany in the run-up to World War II.
"If somebody said 'stop' to (Adolf) Hitler at that point in time, or to Germany at that time, would we have avoided World War II?" he said in a speech to business leaders.
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Tokyo and Manila are shoring up military and political ties, with a joint naval drill last month in the South China Sea. Washington has also sent ships and planes to survey the waters.
While ties between Tokyo and Beijing have warmed a little in recent months, including direct talks between Abe and Chinese President Xi Jinping, relations have been icy for years.
Repeated demands for Tokyo to atone for its wartime aggression have irritated the Japanese public, which increasingly believes Beijing is using history as fuel for its nationalist fire and to bolster the ruling Communist Party's domestic standing.
Japan's Emperor Akihito told Aquino yesterday his country feels "remorse" for its actions during the war.
"During World War II... Fierce battles between Japan and the United States took place on Philippine soil, resulting in the loss of many Filipino lives," he said.
"This is something we Japanese must long remember with a profound sense of remorse," he said.