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BBC Middle East
The G7 also condemns "in the strongest terms" Houthi attacks on Saudi Arabia, saying that the escalation in fighting in Yemen jeopardises global energy security.
The UK says it will provide air-to-air refuelling for "defensive" operations following a request from Saudi Arabia.
The BBC's Frank Gardner speaks to some of those who have fled the war by crossing the Red Sea to Djibouti.
A reported strike on a fuel depot at Riyadh airport caused delays on Saturday, as Saudi Arabia says it shot down a ballistic missile aimed at the capital.
Saudi Arabia has lobbied the US for years to buy F35s, the world's most advanced fighter jet.