Flowers are seen against the backdrop of St. Sophia Cathedral, a former Russian Orthodox church and a perfect example of Neo-Byzantine architectures, in Harbin, capital of northeast China's Heilongjiang Province, April 29, 2016. (Xinhua/Wang Jianwei)

Flowers are seen against the backdrop of St. Sophia Cathedral, a former Russian Orthodox church and a perfect example of Neo-Byzantine architectures, in Harbin, capital of northeast China's Heilongjiang Province, April 29, 2016. (Xinhua/Wang Jianwei)