For decades, Hong Kong served as a bridge between China and Taiwan. Now, that appears to be just one more thing that’s changing in the former British colony.

China’s insistence that Taiwanese officials as a condition of stay in Hong Kong sign a statement agreeing that both sides belong to "one China” adds pressure on Taipei to close its de facto consulate in the city. The decision not only potentially impacts millions of people who travel between the two places each year, it also chips away at the city’s role as a gateway from China to the democratic world.

The move advances two goals of President Xi Jinping: punishing Taiwanese leader Tsai Ing-wen for her refusal to accept the "one-China” framework and curbing perceived sources of outside interference in Hong Kong. The Taipei Economic and Cultural Office in Hong Kong and its predecessor agency have provided Taiwan a diplomatic toehold in the city for more than five decades, outlasting Hong Kong’s return to Chinese rule in 1997.