Liberal Democratic Party Secretary General Taku Yamasaki has drawn up a tentative draft for constitutional revisions that include changing the wording of Article 9 to clarify that Japan will maintain land, sea and air forces and has the right to self-defense, political sources said Sunday.

In addition, the blueprint says the Constitution should clearly state that Japan's citizens have a duty to protect the country and that executive power, which is vested in the Cabinet under the current Constitution, be placed with the prime minister.

While Yamasaki had been penning the draft for some time, Diet sources said it is very rare for a person who carries as much weight as the No. 2 man in the party to propose possible revisions to the Constitution.