It's a slav thing.
Gopota are often seen squatting in groups "in court" (на кортах, na kortakh) or "doing the crab" (на крабе, na krabe) outside blocks of flats or schools with their heels on the ground. It is described as a learned behavior attributed to Russian and Soviet prison culture to avoid sitting on the cold ground.
When performing a “Slav squat”, the heels must stay on the ground. Raised heels are the hallmark of a “Western spy”
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Asian squat
The Asian squat is a deep squat performed by people living in Asian countries for both practical and cultural reasons. People from Asian countries are raised to sit in that position for resting, or in substitute for either standing or sitting in a chair.
Just like the slav squat, the whole foot is flat on the ground,
Why can't Westerners squat?
It may be used as a posture for resting or working at ground level particularly where the ground is too dirty or wet to sit or kneel. Most Western adults cannot place their heels flat on the ground when squatting because of shortened Achilles tendons maybe caused by habit: sitting on chairs or seats.