A roadside bomb killed three American soldiers and wounded two in Baghdad.
The U.S. said the blast occurred Tuesday in east Baghdad but gave no further details.
However, a U.S. Humvee was seen burning Tuesday at an intersection in Mashtal section of eastern Baghdad.
U.S. officials believe mainstream Mahdi forces have generally stuck by the order but breakaway factions of the militia are continuing attacks.
In 2016, Iran bought four divisions of S-300 Favorit anti-aircraft missile systems from Russia. Each division includes 12 launchers
The United States has always been the largest defense spender in the world with China following second. In 2017, Russia started losing its positions and dropped to the fourth place and then to the seventh, in 2019