A Chinese officer of the frigate "Yantai" of the 11th Chinese naval escort flotilla learns street dance from a Bulgarian dancer at the Bulgarian Black Sea port of Varna, Aug. 7, 2012. The frigate arrived here on Sunday to make a five-day goodwill visit. It is the first visit of Chinese navy ship in Bulgaria ever. (Xinhua/Zhou Lei)

Officers and soldiers of the frigate "Yantai" of the 11th Chinese naval escort flotilla enjoys the performance at the Bulgarian Black Sea port of Varna, Aug. 7, 2012. The frigate arrived here on Sunday to make a five-day goodwill visit. It is the first visit of Chinese navy ship in Bulgaria ever. (Xinhua/Zhou Lei)

A Chinese soldier of the frigate "Yantai" of the 11th Chinese naval escort flotilla performs on the deck at the Bulgarian Black Sea port of Varna, Aug. 7, 2012. The frigate arrived here on Sunday to make a five-day goodwill visit. It is the first visit of Chinese navy ship in Bulgaria ever. (Xinhua/Zhou Lei)

Officers and soldiers of the frigate "Yantai" of the 11th Chinese naval escort flotilla enjoys the performance of a Chinese child living in Bulgaria, at the Bulgarian Black Sea port of Varna, Aug. 7, 2012. The frigate arrived here on Sunday to make a five-day goodwill visit. It is the first visit of Chinese navy ship in Bulgaria ever. (Xinhua/Liu Zai)