History of the phrase "for Mother Russia"

Mother Russia has long been familiar as the standard English form of the personification called in Russian Матушка Россия (Россия-матушка, Мать-Россия, Матушка Русь); the use of родина 'motherland' is much less familiar to the English-speaking world and is also ambiguous. It’s possible that the designers simply used the familiar Mother Russia without giving any consideration to authenticity. However, it’s also very possible that For Mother Russia! was a deliberate compromise between an authentic but somewhat opaque For the Motherland! and the familiar personification Mother Russia. If so, they could have done worse: it does at least capture in English the 'mother' of родина 'motherland' while still clearly identifying just which motherland is intended.

(At least they didn’t make it За родину слонов 'For the Motherland of Elephants'!!)

The video game you are talking about was made in the U.S.A. by a company called Atari and the programmers were simply using a cold war reference in the game possibly inspired by movies, television, or books. Mother Russia is a common term in English and there is even an Iron Maiden (British rock band) song with the title "Mother Russia".

Slightly off the page, so far. Mother Russia goes back to the Mongols, sacking Kiev (then capital of Russia), making big parts of Russia belong to Khanates (or at least pay tribute or taxes).

What was left? The rest of the Russians hiding in forests that the Mongols could not be bothered with (while they went to the Rhine and wintered on the Hungarian plains).

Volga, as the trading route between the "still standing" and the "subjugated" parts of Russia was called "my Dear Mother (of Russia)". Have you not heard any of the most popular songs (other than the anthem when another Olympic medal is clocked)? So it is the name for an entity that, strictly speaking, for centuries was not a political entity.

When Russia entered the imperialist expansion stage (Siberia, and towards the Muslim SE) it was important to create this myth of integrity, as well as keeping the ones not integral to that "mythical" area onboard, so to say: White Russians, Ukrainians, Karelians on the other geographical axes – but still part of it.

That's 600 years of "mother" Russia – rather than the Cold War propaganda.