Wall Street titans smiled and schmoozed at a Saudi investment conference widely shunned last year over a critic's murder, but as wariness lingers some delegates kept their name cards discreetly out of sight.

Prime Minister Narendra Modi on Tuesday pressed for the reform of the United Nations while expressing regret over some countries using the global body as a "tool" rather than an "institution" to resolve conflicts.

Saudi Arabia on Tuesday inaugurated a three-day high-profile financial summit, being attended by Prime Minister Narendra Modi and several other world leaders, aimed at drawing foreign investors to help the Gulf Kingdom diversify its oil-based economy.