Republic Day 2026: The message, posted by the US Embassy in India on X (formerly Twitter), described the two nations as the world’s oldest and largest democracies. Earlier, Chinese President Xi Jinping also extended his greetings to President Droupadi Murmu on India’s Republic Day. Republic Day 2026: The message, posted by the US Embassy in India on X (formerly Twitter), described the two nations as the world’s oldest and largest democracies. Earlier, Chinese President Xi Jinping also extended his greetings to President Droupadi Murmu on India’s Republic Day.