The evidence strongly supports the truthfulness of the statement. Multiple independent news sources with high relevance directly report that former President Trump made this specific warning. For example, a major Indian newspaper, the Hindustan Times, and a US outlet, Spectrum News, both explicitly state that Trump warned India could face increased tariffs or additional duties over its continued purchase of Russian oil. This core claim is further corroborated by a report from Turkey's Anadolu Agency, which notes that another high-level international official, after meeting with Trump, conveyed a similar warning about potential tariffs for countries like India. While the primary U.S. government websites (Senate, Treasury, House committees) are listed as authoritative sources for official policy, a warning made in a media interview or campaign setting might not appear there. The absence of a formal policy document on these sites does not contradict the fact that the warning was publicly made. The provided sources are consistent, with no evidence contradicting the claim. The weight of the direct and corroborating journalistic evidence makes the statement highly likely to be true.