The victory of Lai Ching-te of Taiwan's Democratic Progressive Party in the presidential election on Saturday will put the relationship between South Korea and China to the test, given Seoul's unique geopolitical position and the need to strike a balance between Beijing and Washington.

Taiwan President Tsai Ing-wen resigned as head of the ruling Democratic Progressive Party (DPP) on Saturday after her strategy to frame local elections as showing defiance of China's rising bellicosity failed to pay off and win public support.