LONDON - The historic deal to curb Iran's nuclear programme should be given time to work, but Tehran's intentions must be viewed with deep scepticism, Britain's newspapers said Monday.
The Daily Telegraph argued that the deal was the best option on the table, but that the world needed to be extremely cautious.
"Given that Iran's nuclear ambitions have had no rational purpose except to give its ruthless leaders the option of building the ultimate weapon, we are entitled to approach this deal with deep scepticism and caution," said its editorial.
"But rejecting the deal would have meant that Iran's nuclear programme expanded month by month, until the terrible moment arrived when America would have had little choice but to go to war," it added.
"On balance, we will be safer with this pragmatic agreement than without it. The West, however, should not drop its guard."
Iran agreed to curb its nuclear programme for the next six months in exchange for limited sanctions relief, in a preliminary accord meant to lay the foundations for a comprehensive agreement later this year.
Business publication the Financial Times hailed the pact as "a historic moment" and said that the shadow cast by US military actions in Iraq and Afghanistan meant a peaceful solution was worth striving for.
"Diplomacy has enjoyed few breakthroughs," said its editorial. "The world must give this one a chance."