In the LXX, it was going to be individual members with ancestry from those named nations of Persia Ethiopia, Libya, Gomer, Togarmah, etc. It says Gog's army would be composed of "Persians, Ethiopians, Libyans," etc.. This predicted individuals with that ancestry who would be joining Simon bar Gioras' army. This Zealot leader had gone over all Israel and Idumea, etc.. collecting malcontents and conscripted soldiers from far and wide to join him in his AD 69 assault on Jerusalem. His army amounted to around 40,000 at that point, as Josephus said, which was the largest of any of the other Zealot leaders. He "took a prey" and confiscated "spoil" to supply his army from every quarter of Israel.
ALL of Simon's soldiers were "handling swords" (Ezekiel 38:4). This was the typical weapon of choice of the Zealots and the vicious sicarii. The word "sicarii" derives from the Latin word "sica", meaning a short curved dagger. We have uncovered examples of this type of curved short dagger, which the Zealot sicarii were experts at wielding against their enemies.
The word "rosh" or "ros" is an adjective meaning a "chief" prince, or a notable prince of high rank. It's NOT a proper noun representing a nation. To insert modern day Russia into this prophecy is pure conjecture.
Simon bar Gioras's name was on the coins minted in Jerusalem dated from AD 66 at the beginning of the Zealot rebellion. Josephus writes that not only slaves and robbers composed Simon's army, but "a great many of the populace were obedient to him AS THEIR KING" (Wars, 4.9.4). Simon bar Gioras fulfilled the whole "chief prince" title in those great tribulation years from AD 66 until AD 70. Even the Romans acknowledged Simon as being the titular "King of Israel" when they captured him in Jerusalem.