June 14, The NAME_1 transited the Luzon Strait westbound; Participated in a PHOTOEX with the RSS Intrepid (FFS 69) on June 17; Transited the Strait of Singapore on June 18; Transited the Malacca Strait northbound from June 18-19. Extract the following items only from this news: 
                 -the date
				 -the Subject
				 -the Object
				 -the Location
                Format your response as a JSON object with "date" , "Subject " ,"Object "and "Location" as the keys. 
				The Object and the Subject must be entity names.
                If the information isn't present, use "unknown" as the value.
                Make your response as short as possible.