* China unveils retaliatory tariffs on U.S. goods
* Investors await U.S. policy clues from Fed Chair's speech (Updates prices, adds detail)
By Bozorgmehr Sharafedin
LONDON, Aug 23 (Reuters) - Oil prices fell sharply on Friday after China unveiled retaliatory tariffs against about $75 billion worth of U.S. goods, marking the latest escalation of a protracted trade dispute between the world's two largest economies.
Brent crude futures, the international benchmark for oil prices, fell 88 cents to $59.04 a barrel by 1327 GMT.
U.S. West Texas Intermediate (WTI) crude futures slid by $1.33 to $54.02.
"Policymakers and investors remain cognizant of the economic headwinds that are gathering force, given that the U.S.-China trade conflict threatens to drag on for longer," said FXTM market analyst Han Tan.
China's commerce ministry said it would impose additional tariffs of 5% or 10% on a total of 5,078 products originating from the United States, including agricultural products such as soybeans, crude oil and small aircraft.
Market attention was also focused on a speech by U.S. Federal Reserve chief Jerome Powell at a meeting of global central bankers at Jackson Hole, Wyoming, hoping for news on whether it will cut interest rates for a second time this year to boost the U.S. economy.
Meanwhile, St. Louis Federal Reserve Bank President James Bullard said policymakers will have a "robust debate" about cutting U.S. interest rates by half a percentage point at their next policy meeting in September.
Exacerbating concern over the possibility of recession, U.S. manufacturing industries registered their first month of contraction in almost a decade.
"Some have blamed the hesitant tone (for oil prices) on an end-of-summer lull. Yet, in truth, the sense of unease stems from ongoing worries about the global economy," said Stephen Brennock of oil broker PVM.
Harry Tchilinguirian, of BNP Paribas, said the market had some other bearish data, noting a rise in Saudi Arabian oil exports while Russia’s crude output moved above its quota under an OPEC+ agreement. He also pointed to Russian oil major Rosneft helping to ship Venezuelan oil to China and India.
OPEC, Russia and other producers have, since Jan. 1, implemented a deal to cut output by 1.2 million barrels per day. The alliance, known as OPEC+, renewed the pact in July, extending the curbs to March 2020 to avoid a build-up of inventories that could hit prices.
Iran's foreign minister said talks held on Friday with French President Emmanuel Macron about a landmark 2015 nuclear deal were "productive".
Iran has said it will scale back compliance with the pact unless the Europeans find a solution enabling Tehran to sell its oil despite U.S. sanctions.
Additional reporting by Florence Tan in Singapore Editing by David Goodman