Modi, who arrived here this afternoon, discussed a wide variety of issues with the leaders of various delegations from UK, Japan, Singapore among others who are here to participate in the Summit.
Modi and Tobgay discussed security cooperation including in recent times, following the events in Assam where Bodo militants carried out attacks on tribals and killed 70 people.
"They agreed that cooperation and coordinating efforts is the best way to proceed," an official source said.
During his discussions with Janusz Piechocinski, Deputy Prime Minister of Poland, they talked about the possibilities for defence cooperation through the 'Make in India' initiative as also the possibilities of cooperation in the mining sector, sources said.
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Terror threats to open societies after what happened in Paris and Sydney recently and a trade pacts to boost commercial ties were some of the key issues deliberated during Modi's interactions with Lord Ian Livingston, British Minister of State for Trade and Investment and Australian Trade Minister Andrew Robb.
Apart from ways to work on a comprehensive trade pact, Modi and Robb also discussed 'Make in India' initiative road show in Australia with more than 400 business delegation visiting eight cities, the sources said.