The White House said Wednesday that no negotiations could be held with North Korea until it improves its behaviour.
Amending the charter’s pacifist Article 9 would be hugely symbolic for Japan.
A hefty victory would raise the likelihood that Abe will win a third term as LDP leader next September and go on to become Japan’s longest-serving premier.
Abe’s image as a strong leader has bolstered his ratings amid rising tensions over North Korea’s nuclear arms and missile programmes.
Abe’s ratings had sunk below 30% in some surveys in July, battered by suspected cronyism scandals and a perception that he had grown arrogant.
Japan voters cast ballots on Sunday in election that could spell trouble for Prime Minister Shinzo Abe, suffering from a scandal over suspected favouritism.
With three years left for the Tokyo Olympics, the government plans on ramping up security, but is receiving backlash for clamping down on privacy rights.
Patriotic educational reforms and amending the country’s postwar, pacifist constitution have been key goals for Abe and his party.
Japan temporarily recalled its ambassador to South Korea and suspended talks on a new currency swap arrangement but North Korea’s martial intentions could contain tensions.
Abe said that Russia’s deployment of missile systems was “regrettable”, less than a month before Putin is to visit Japan for talks aimed at formally ending World War Two.
Akihito may appear live on television on August 8 to outline his concern that age and health problems mean that he cannot do his job fully.
Abe, already Japan’s longest ruling premier in a decade, will retain his right-hand man, chief cabinet secretary Yoshihide Suga, along with finance minister Taro Aso and foreign minister Fumie Kishida, media reports said.
Prime Minister Shinzo Abe’s Liberal Democratic Party won a simple majority for the first time since 1989, a win that will bolster his grip over the conservative party.
Japan’s fast-ageing society is one where political activism has a bad name and views and votes are overwhelmed by a more powerful older generation.
Experts have said that till the market is volatile, the Japanese voter will opt for stability and vote for the Liberal Democratic Party.