The high-octane romantic stunt was filmed in a video published by the defence ministry on Friday, Valentine´s Day.
As snow fell, the T-72B3 tanks rolled into position on the Alabino training ground outside Moscow.
Lieutenant Denis Kazantsev led his long-term partner Alexandra Kopytova into the centre as she held her hands over her eyes, the defence ministry´s TV channel Zvezda reported.
Kazantsev, a platoon commander, went down on bended knee, holding a bunch of red roses.
“We´ve been together a very long time. We´ve stood the test of time and distance. Marry me!” he said as his girlfriend nodded silently. He then put a ring on her finger.
“I still don´t understand what´s going on,” Kopytova told a television reporter at the scene. “It´s very unexpected.”
The tanks used for the romantic manoeuvre also take part in the annual Victory Parade on Red Square, Zvezda.