Washington, Jan. 6 -- US President Donald Trump implied that India had reduced purchases of Russian oil in an effort to make him "happy", and warned that Washington could raise tariffs on New Delhi "very quickly". Trump spoke alongside US Senator Lindsey Graham, who stated that India's envoy to Washington had informed him that the country was purchasing less Russian oil. "Modi is a very good guy and he knew I was not happy. And it was important to make me happy. They do trade and we could raise tariffs on them very quickly," Trump told reporters aboard Air Force One on Sunday local time. Trump spoke in response to Senator Graham, who credited Trump's 25% tariff penalty on India as a key reason for declining purchases of Russian energy. "I w...