Investors sought safe havens such as the U.S. dollar, strengthening the currency and making dollar-denominated commodities more expensive for holders of other currencies.

Still, global crude supplies could tighten in the second half as the OPEC+ grouping, the Organisation of the Petroleum Exporting Countries and its allies, including Russia, is making additional output cuts that are reducing crude availability.

The group announced in April that some members would cut output further by around 1.16 million barrels per day, bringing the total volume of cuts to around 3.66 million bpd.