What year did Japan declare war on China during World War 2?

Answer 1

If I remember correctly, Japan simultaneously attacked UK targets along with the Pearl Harbor attacks and the various other ones that occurred around the Pacific such as Wake. The actual declaration from London, I am not quite sure but I would say within a day.

Answer 2

Russia declared war on Japan on 8th August 1945. Two days after Hiroshima was bombed with an atomic weapon.

Answer 3

Japan attacked China long before the rest of the world got involved in World War 2, beginning by taking control of Manchuria in 1931-33. Then in 1937 they moved against the entire country.