China's heavy-handed tactics in Hong Kong could be also hurting its cause in Taiwan.

In recent weeks, Taiwan's China-skeptic president, Tsai Ing-wen, has come out strongly against Hong Kong's proposal to allow extraditions with the mainland. The criticism has not only won Tsai praise from democracy advocates in Hong Kong, it also has helped her recover from a local election defeat last year that threatened to scuttle her bid for a second term.

On Thursday, Tsai secured the nomination of the Democratic Progressive Party, clearing her to run again under the pro-independence party's banner in January. She overcame one of the party's most vocal China critics in part by taking a firm line against Beijing.