The new strategy marks a historic change to Japan's exclusively self-defense policy since the end of World War II. Here is a look at Japan's new security and defense strategies and how they will change the country's defense posture.

The biggest change in the National Security Strategy is possession of “counterstrike capability” that Japan calls “indispensable." Japan aims to achieve capabilities ”to disrupt and defeat invasions against its nation much earlier and at a further distance” within about 10 years.

This puts an end to the 1956 government policy that shelved capability to strike enemy targets and only recognized the idea as a constitutional last-ditch defense.

Japan says missile attacks against it have become "a palpable threat" and its current interceptor-reliant missile defense system is insufficient.

North Korea launched missiles more than 30 times this year alone including one that overflew Japan, and China fired ballistic missiles into waters near southern Japanese islands.

Japan says the use of counterstrike capability is constitutional if it's in response to signs of an imminent enemy attack, but experts say it is extremely difficult to conduct such an attack without risking blame for striking first.

Opponents say strike capability goes beyond self-defense under Japan's pacifist constitution.

Japan aims to double its defense spending to about 2% of its GDP to a total of about 43 trillion yen ($320 billion) through 2027.

The new spending target follows the NATO standard and will eventually push Japan’s annual budget to about 10 trillion yen ($73 billion), the world’s third biggest after the United States and China.