In 1899, the Boxer Rebellion broke out with Chinese nativist attacks on all foreigners. A large coalition of eleven major Western powers, led by Russia and Japan, sent an army to relieve their diplomatic missions in Peking and to take control of the Chinese capital. The Russian government used it as an opportunity to bring a substantial army into Manchuria, which became a fully-incorporated outpost of Russia in 1900. Japan started to prepare for a war with Russia over Korea and Manchuria.