UK Prime Minister Boris Johnson has defended a trip to Saudi Arabia, saying "the widest coalition" is needed to end reliance on Russian oil and gas.
But maintaining close ties with the Gulf kingdom is controversial among critics of its human rights record.
Why is Saudi Arabia so important for oil?
The US, UK and EU have announced that they will buy less Russian oil and gas, because of its invasion of Ukraine. However, prices have rocketed.
Saudi Arabia is the largest producer in the oil cartel Opec and has the spare capacity to help lower prices by increasing supplies.