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President Barack Obama said the United States could be India's "best partner" as he on Tuesday wrapped up a three-day visit to New Delhi by highlighting the shared values of the world's biggest democracies. Speaking to an audience of young people, the US president reiterated that the relationship between Washington and New Delhi "can be one of the defining partnerships of this century" but warned the battle against climate change would be doomed unless India was fully on board. The speech was the finale of a packed visit which has seen a dramatic upturn in an often troubled relationship, including the signing of a new "friendship" declaration between Obama and Prime Minister Narendra Modi. The right-wing premier was persona non grata in Washington less than a year ago but has developed a close bond with Obama, with their two countries both keen to counter-balance the rise of China.