PM Nguyen Xuan Phuc made the remarks at the G7 outreach meeting in Japan Friday
"We must have the courage to escape the logic of fear and pursue a world without [nuclear stockpiles]."
Telephone polls suggesting "In" is comfortably ahead while online polls suggest a tight race that "Out" could win.
Critics accusing both Japan and the US of having selective memories
The G7 expressed concern over the East and South China Seas, where China has been taking more assertive action amid territorial...
"Prime Minister (Shinzo) Abe led discussion on the current situation in the South China Sea and East China Sea. Other G7 leaders...
Britain and Germany have been resisting calls for fiscal stimulus.
The G7 leaders are also expected to reaffirm their previous commitment to stability in the foreign exchange market.
Abe has said he hopes the shrine visit will provide an insight to the heart of Japanese culture.
Okinawa, the site of a brutal World War Two battle, hosts the bulk of U.S. military forces in Japan...
Japan expects to discuss Chinese slowdown, maritime disputes
G7 leaders called for a mix of monetary, fiscal and structural policies to boost demand but left it to each...
Japan is at odds with U.S. on currency market conditions
They agreed that structural reforms combined with appropriate investment are solutions to achieving sustainable growth