I draw your attention to that ,that for a group of Russian citizens from 2 people ,arriving at Sanya airport with a direct non-stop flight of Transaero Airlines or with Cathay Pacific Airways flights through Hong Kong ,possible registration of a group visa-free list ,with such variant of the route Moscow - Hong Kong (transit) - Sanya - stop in Hong Kong - Moscow ,you do not need to issue a visa (From July 1, 2009 for citizens of the Russian Federation ą $ ,from November 3, 2010 for the citizens of Ukraine ,from July 26, 2012 for citizens of Kazakhstan no entry visa is required for visiting the Special Administrative Region of the People's Republic of China Hong Kong ,if the period of stay does not exceed 14 days )

With other variations of the air travel, and if you plan to fly to Hong Kong for a few days from Hainan Island and return back, you should get a two-fold individual Chinese visa (put on a foreign passport).