Nearly 80 percent of UN members recognize the State of Palestine, with a string of countries including Britain, Canada and France adding their names this week after nearly two years of war in Gaza.

"I feel strongly indignant at the statements made by senior Israeli government officials that appear to categorically reject the very notion of Palestinian state-building," Shigeru Ishiba said.

"For our country, the question is not whether to recognize a Palestinian state, but when. The continued unilateral actions by the government of Israel can never be accepted," he said.

"I must state clearly that if further actions are taken that obstruct the realisation of a two-state solution, Japan will be compelled to take new measures in response," he added.

Nearly two years since the war erupted, the Israeli military has killed 65,382 Palestinians, mostly women and children, says the Palestinian health ministry, figures the UN considers reliable.

Japan, a member of the G7, is a close ally of the United States and hosts some 54,000 US military personnel.

Elsewhere in Asia, South Korea and Singapore have also stopped short of recognizing Palestine as a state.

Ishiba said that the "terror inflicted by Hamas and the devastation in Gaza we are witnessing today have left many feeling deeply saddened."

"What matters the most is that Palestine can exist in a sustainable manner, living side by side in peace with Israel," Ishiba said.

"As we invite Palestine to assume its role as a responsible member of the international community. The Palestinian side must establish a system of governance that ensures accountability," he added.