Japanese Prime Minister Shinzo Abe has made history as the first Japanese head of government to address the special joint session of the US Congress. He expressed remorse for World War II and touched on issues sensitive to Americans, including Pearl Harbor, while emphasizing his commitment to strengthen their alliance. His emphasis on the common values shared by the two countries - "the rule of law, democracy, and freedom" - went down well with most Americans.

But not so for some in Asia. While Abe expressed "remorse", China and the Republic of Korea have quickly and strongly criticized the refusal to acknowledge and directly apologize for the atrocities committed by the Japanese during WWII.

In truth, what was said was better than some feared. Not long before speaking in the US, Abe sent a ritual offering to the controversial Yasukuni Shrine, which honors 14 Class-A war criminals, while over 100 members of the Diet also visited in person. There have been bouts of "Abenesia" that have downplayed Japan's WWII atrocities which characterize the conservative, right-wing thinking that many believe reflect the current leaning.

There was even some talk that he would retreat from the 1995 stance by then prime minister Tomiichi Murayama. In this context, there is relief that Abe did not do so. But just maintaining that position may not be enough.

This year will witness many WWII anniversaries - including Beijing's celebratory military parade. Others will put forward their own and very different versions of history to which Japan will need to respond.

The need is also driven by Abe's ambitions to build up Japan's political and security role. Tokyo can try to dress this up as self-defense and support for the US. But many still see a build-up that is aimed at heading off China's growing strength.

Southeast Asians do need to watch developments. Despite many parts of the region having been occupied in WWII, there has been a pragmatic reticence in the region since the Fukuda Doctrine of the late 1970s unleashed a wave of investment.

However, nothing should be taken for granted. Southeast Asians will need to watch that Abe's expanding view of Japan's role in security does not add to the tensions in the region.