BEIJING - The All-China Federation of Trade Unions and the All-China Women's Federation issued statements on Thursday,  expressing strong indignation toward and opposition against Japan's so-called "purchase" of the Diaoyu Islands.

Despite strong warnings and opposition voiced by top Chinese leaders, the Japanese government on Tuesday signed a purchase contract with the Kurihara family, which Japan claims is the "private owner" of the Diaoyu Islands.

The statement of the All-China Federation of Trade Unions reads, "Chinese laborers and employees hereby express our firm opposition to any attempts by Japan to jeopardize China's territorial sovereignty. We will stand firmly behind the government in any necessary measures to safeguard the nation's sovereignty."

The statement of the All-China Women's Federation reads, "Chinese women will rally behind the government in any necessary measures to protect the nation's sovereignty. We strongly demand Japan stop any move that might impair China's territorial sovereignty."