It is. Those tanks were ferry tanks, permanently attached for the flight.
The sub sonic range without external tanks was about 700 nm.
Supersonic intercept range (it's primary mission) was 135 nm.
With the ferry tanks it added maybe 500 nm to subsonic range.
In otherwords an aircraft designed to intercept Russian bombers for V Bomber airfield defense.
But Mach 2.2 remains very quick. It was a real hotrod.