This is the second time President Trump and Russian President Vladimir Putin have spoken on the phone this month.

Israel unleashed airstrikes across Iran for a third day on Sunday and threatened even greater force as some Iranian missiles evaded Israeli air defenses to strike buildings in the heart of the country.

Donald Trump has warned that if Iran attacks, the US military will "come down with full force" as tensions in the Middle East escalate due to Tehran's fighting with Israel. He reiterated Washington's stance that it is not involved in the war and warned allies not to help Israel stop Iran's retaliatory strikes.