A foreign delegate signs a guest book during his visit to the landing vessel Jinggangshan of the Chinese People's Liberation Army (PLA) Navy in Qingdao, east China's Shandong Province, April 25, 2019. Foreign delegations invited to participate in the multinational naval events marking the 70th anniversary of the founding of the Chinese PLA Navy visited Chinese vessels and communicated with Chinese soldiers and officers on Thursday. (Xinhua/Li Ziheng)