Hosting a Summit of leaders of Germany, Japan and Brazil under the G-4 format here, he said the UNSC "must include the world's largest democracies, major locomotives of the global economy, and voices from all the major continents" to carry "greater credibility and legitimacy".
He said the four countries are ready to assume global responsibilities as he pressed for change, saying the world body reflects the mindset of a century "we left behind" and is not in tune with "new concerns" like terrorism and climate change.
Modi noted that "some movement" had been seen recently in the decades-old endeavour when the UNGA took the "significant step" to commence text-based negotiations on the reforms but said it has to be taken to its "logical conclusion" during the current 70th session of the global body.
In a joint statement later, the G-4 leaders stressed that "a more representative, legitimate and effective Security Council is needed more than ever to address the global conflicts and crises, which had spiraled in recent years."
The leaders emphasized that the "G-4 countries are legitimate candidates for permanent membership in an expanded and reformed Council and supported each other's candidature.