They have gone to war with the Mongols in 1274.
Then again with the Mongols in 1281.
And then in 1592-1598 Korea and China.
Those are all of the ones I can think of right now.
gerany and japan had both sufferd after the war.
Italy and japan
japan
Costa Rica has had a civil war, but never a war with other countries.
After Japan attcked Pearl Harbor we declared war of Japan, and Germany.
I believe that they were involved in the 6 day war with Israel in 1967.
They could protect their language, religion and beliefs without the interference of other countries, and war between other countries didn't affect Japan.
China, France, Japan...then the Vietnam War involving the US.
The only countries featured in World at War are America, Japan, Germany, and the Soviet Union. All other countries are not in the game.
Japan went to war with many countries. In the Sino-Japanese war, they went to war with China. Japan invaded Taiwan in 1985. In the Russo-Japanese war, they went to war with Russia. In World War I, they were a part of the Allied Forces and battled against Germany and Russia. In World War II, they sided with the Axis powers, against The US, Britain, France, and other smaller Western European countries.
They believed it would end the war, and act as a warning to other countries.
Both Germany & Japan maintained Liaison Officers in each other's countries to maintain coordination with each other.