New Delhi, June 22 -- Global crude oil prices may face sharp upward pressure when markets open for trade Monday, after the US launched air strikes on three Iranian nuclear facilities - Natanz, Fordo and Isfahan - escalating tensions in the Middle East.

The strikes have raised concerns of supply disruptions that could hit major importers like India, which depends on overseas oil for more than 85% of its energy needs.

In a televised address on Sunday (India time), US President Donald Trump confirmed the direct American assault on Iran's nuclear programme, ending days of speculation about Washington's entry into the Israel-Iran conflict. He warned that further strikes could follow.

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