Diplomatic relations at embassy level
Germany Japan Romania Hungary
Japan
Japan, Italy, Romania, Hungary
Axis pact of the Axis Powers: Germany, Italy and Japan; Romania joined this pact at 23 November 1940.
Russian ocupation in Hungary and Romania, American occupation in Japan in Germany, terror, huge payments, etc. Bulgaria was not seriously punished.
The three major Axis powers, Nazi Germany, Fascist Italy, and Imperial Japan were part of a military alliance on the signing of the Tripartite Pact in September 1940, which officially founded the Axis powers.
Germany, Japan, Italy, Romania, Bulgaria, and Hungary
Italy, Romania and somewhat Japan
Italy, Japan, Hungary, Slovakia and Romania.
Italy, Japan, Bulgaria, Hungary, Romania
Germany, Japan, Italy, Romania, Hungary, Bulgaria, Thialand
Very probable Romanians in 1690 neither had heard that there was a country called Japan.