Japanese Prime Minister Shinzo Abe extended his congratulations to Hun Sen for being re-elected as the prime minister of Cambodia for another five-year term after his ruling party won the July 28 election.

"On behalf of the government and the people of Japan, I would like to express my congratulations to you for being re-elected as the prime minister of Cambodia and for the formation of a new government," he said in a message to Hun Sen that was released to the media by Cambodia's Ministry of Foreign Affairs on Tuesday.

"I wish to see further progress in the parliamentary democracy through dialogue and cooperation between the ruling party and the opposition party so that Cambodia (can) implement various measures steadily toward economic and social development under your leadership," he said.

Abe added that Japan would continue to actively support Cambodia in its nation-building efforts.

"I will actively cooperate with you in order to make closer ties between Japan and Cambodia and to strengthen cooperation in seeking solutions to issues on international arenas," he said.

Hun Sen, 61, who had been in power for 28 years, was re-elected as the prime minister of Cambodia on Sept. 24 by his ruling party's formed parliament as the opposition party's lawmakers boycotted the parliamentary session since they refused to accept the results of the July 28 election.

Opposition leader Sam Rainsy said last Wednesday that his party did not recognize the Hun Sen-led government, claiming that the newly-formed government was a violation of the constitution.

However, Hun Sen defended that his government was "legitimate" since the nation's King Norodom Sihamoni had already given endorsement.