The two countries' feud over the islands, called the Southern Kurils by Russia and the Northern Territories by Japan, has prevented them from signing a peace treaty.
The two presidents also discussed the peace and stability of the Korean Peninsula.
The two suspects have been put under criminal detention for further investigation.
The trips to convey the results of the Xi-Kim talks illustrate the proactive side of China's diplomacy and the country's important role, Zhang said.
The two countries can also promote the diffusion and application of technologies in developing countries and promote inclusive global development by relying on the Belt and Road Initiative, the most extensive international cooperation platform conforming to the trend of economic globalization, following the principle of extensive consultation, joint contribution and shared benefits.
The two sides reaffirmed their commitment to the principles of freedom of navigation in and overflight above the South China Sea, freedom of international commerce and other peaceful uses of the sea, believing that the proper management of disputes in the South China Sea is vital in safeguarding regional peace and stability.
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The two heads of state will exchange in-depth views on China-US relations and major global and regional issues of common concern, Lu said.
The traditional snack became a hot topic in 2012, when netizens expressed outrage at a vendor in Xinjiang accused of charging inflated prices for his nutcakes.
The triumph marked the first Olympic gold for China women's volleyball team and their feats, after that, winning the World Cup in 1981 and the World Volleyball Championships in 1982.
The two sides exchanged views on promotion of information, culture and tourism cooperation in the six provinces of northern Laos.