At the same time, Japan's progress in China was still not much, although the nationalist and communist Chinese began fighting each other again. Japan was planning to take over European colonies in Asia while they were weak, and the Soviet Union could feel a danger from Germany, so a non-aggression pact (which was an agreement that both countries would not attack each other) between the two was signed in April 1941. However, Germany kept preparing an attack on the Soviet Union, moving its soldiers close to the Soviet border.