Thousands of protesters marched in Taiwan today (Sunday) against a planned Chinese law meant to prevent the island from declaring independence.

The protesters carried banners opposing the proposed anti-secession law as they marched through Taiwan's southern Kaohsiung City. The pro-independence Taiwan Solidarity Union organized the demonstration.

China's National People's Congress is expected to pass the law this week.

Beijing continued to claim sovereignty over Taiwan after China's civil war ended in 1949. It has repeatedly threatened to attack if Taipei formalizes independence.

Earlier Sunday, China warned that increasing U.S.- Japan military cooperation should be strictly bilateral and not include Taiwan.

Chinese Foreign Minister Li Zhaoxing told a news conference (Sunday) that putting Taiwan directly or indirectly into the scope of a U.S.-Japan security alliance constitutes an encroachment on China's sovereignty.