KUALA LUMPUR (Oct 23): Prime Minister Datuk Seri Najib Razak has congratulated Japanese Prime Minister Shinzo Abe, who has won the mandate to lead Japan, after a landslide win in Sunday's parliamentary elections.

Najib tweeted Abe and said he was looking forward to further strengthening the close cooperation between the two countries.

"Congratulations on your victory @AbeShinzo! Looking forward to further strengthening the close cooperation between our two countries," Najib said.

According to Reuters, Abe's ruling bloc scored a big win in Sunday's election, bolstering his chance of becoming the nation's longest-serving premier and re-energising his push to revise the pacifist constitution.

Abe's Liberal Democratic Party (LDP)-led coalition won a combined 312 seats, keeping its two-thirds "super majority" in the 465-member lower house, local media said.

A hefty win raises the likelihood that Abe, who took office in December 2012, will secure a third three-year term as LDP leader next September and go on to become Japan's longest-serving premier. It also means his "Abenomics" growth strategy centered on the hyper-easy monetary policy will likely continue.

Abe, 63, has already led the LDP and its partner, the Komeito, to four landslide wins since he took the helm of the party. But turnout has been low and the LDP has typically won with about 25% of eligible votes. Others either stayed home or backed opposition parties.

Abe had said he needed a new mandate to tackle a "national crisis" from North Korea's missile and nuclear threats and a fast-aging population, and to approve his idea of diverting revenue from a planned sales tax hike to education and child care from public debt repayment.