The government is planning to highlight diplomatic initiatives advocated by assassinated former Prime Minister Shinzo Abe in its long-term security policy guideline slated to be updated by the end of this year, a government source said Wednesday.

In the revised National Security Strategy, Tokyo will also mention that "no unilateral change of the status quo by force will be tolerated" regarding Taiwan, as China has been stepping up military provocation against the self-ruled democratic island.

Abe, who was fatally shot in July, is known for having proposed the security framework called "the Quad," involving Australia, India, Japan and the United States, and promoting a "free and open Indo-Pacific" to tackle China's growing regional assertiveness.