Indian stock markets, including the Sensex and Nifty, are expected to open cautiously on Thursday due to concerns over potential US tariff hikes and ongoing foreign fund selling. Weak global cues and trade tensions, particularly a US threat of up to 500% tariffs on Indian goods over oil purchases from Russia, are weighing on investor sentiment. This follows a bipartisan sanctions bill approved by the US President, which could impact countries like India, China, and Brazil.