Why is Japan changing its ban on exporting lethal weapons, and why is it so controversial?

abcnews.go.com:

Japan’s Cabinet OK’d a plan to sell future next-generation fighter jets to other countries on Tuesday, its latest step away from the pacifist principles the country adopted at the end of World War II

TOKYO — TOKYO (AP) — Japan's Cabinet OK'd a plan to sell future next-generation fighter jets to other countries on Tuesday, its latest step away from the pacifist principles the country adopted at the end of World War II.

The controversial decision to allow international arms sales is expected to help secure Japan's role in a year-old project to develop a new fighter jet together with Italy and the U.K., but it's also part of a move to build up Japan's arms industry and bolster its role in global affairs.

For now, Tokyo says that it doesn't plan to export co-developed lethal weapons other than the new fighters, which aren't expected to enter service until 2035.

Here is a look at what the latest change is about and why Japan is rapidly easing weapons export rules.

On Tuesday, the Cabinet approved a revision to its guidelines for selling defense equipment overseas, and authorized sales of the future jet. The government says that it has no plans to export other co-developed lethal weapons under the guidelines, and it would require Cabinet approval to do so.

Japan has long prohibited most arms exports under the country's pacifist constitution, although it's begun to take steps toward a change amid rising regional and global tensions. In 2014, it began to export some non-lethal military supplies, and last December, it approved a change that would allow sales of 80 lethal weapons and components that it manufactures under licenses from other countries back to the licensors. The change, which was made in December, cleared the way