Oil prices fell to negative territory after rising by a dollar in post-settlement trade on April 2 as U.S. President Donald Trump announced reciprocal tariffs on trading partners, stoking concerns that a global trade war may dampen demand for crude.

Brent futures settled $0.46 higher, or 0.6%, at $74.95/ bbl, while U.S. West Texas Intermediate crude futures gained $0.51, or 0.7%, to settle at $71.71.

U.S. futures rose by a dollar and then turned negative over the course of Trump's press conference on April 2 in which he announced tariffs on trading partners including the European Union, China and South Korea.

For weeks Trump has touted April 2 as "Liberation Day," bringing new duties that could rattle the global trade system.

A chart listing countries and tariffs that Trump showed during his announcement did not detail tariffs on Canada and Mexico. Canada exports some 4 MMbbl/d of its crude oil to the United States.

Trump's tariff policies could stoke inflation, slow economic growth and escalate trade disputes, possibilities that have limited oil price gains.

"Crude prices have paused last month's rally, with Brent finding some resistance above $75, with the focus for now turning from a sanctions-led reduction in supply to Trump's tariff announcement and its potential negative impact on growth and demand," said Ole Hansen, head of commodity strategy at Saxo Bank.

Comments from Mexico eased some worries about a trade war between the two countries after Mexican President Claudia Sheinbaum said on Wednesday that Mexico does not plan to impose tit-for-tat tariffs on the United States.

Trump has also threatened to impose secondary tariffs on Russian oil, and on Monday he toughened sanctions on Iran as part of his administration's "maximum pressure" campaign to cut its exports.

Adding to the complex global supply picture, Russia, the world's second-largest oil exporter, on Wednesday imposed restrictions on another major oil export route, suspending a mooring at the Black Sea port of Novorossiisk a day after restricting loadings from a key Caspian pipeline.

Russia produces about 9 MMbbl/d of oil, or just under a tenth of global production. Its ports also ship oil from neighbouring Kazakhstan.

Meanwhile, investors on April 2 shrugged off mostly bearish U.S. government crude inventory data. U.S. crude inventories posted a surprisingly large build of about 6.2 MMbbl last week, Energy Information Administration data showed. 

"The report was bearish in my view, with larger crude inventories and total petroleum inventories rising," UBS analyst Giovanni Staunovo said. "But the market took it as neutral, as the crude build is driven by a sharp increase in Canadian crude imports, likely ahead of the fear of the introduction of new tariffs."

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