U.S. President Donald Trump has warned that Washington could raise tariffs on India if New Delhi does not cooperate on reducing Russian oil imports. Trump stated that Prime Minister Narendra Modi was aware of his displeasure and that India acted to "make him happy." U.S. Senator Lindsey Graham claimed that existing U.S. tariffs are a primary reason for India's reduced Russian oil purchases and that the Indian ambassador requested tariff relief. India maintains its oil purchases are essential for energy security.