<human>:  Who designed the Russian T-72 tank?
<bot>: The T-72 was designed by Soviet engineers in the 1970s. It is a tank that is still in service today. The tank has been upgraded several times, but the basic design is the same. The T-72 is armed with a 125 mm smoothbore gun, and has a crew of 3. It is a heavy tank, and can weigh up to 45 tons. It is also very fast, with a top speed of 60 km/h.