I have a demilled and non-functional AKM that I use as a training aid. It was never intended for sale in the US, yet it's marked in Cyrillic and English.
I also have a Saiga shotgun, which was intended for sale outside Russia. One rollmark says "Made in Russia" in Cyrillic, and again in English - all as part of the same marking.
English is the universal commerce language. Even the MAS series of rifles is stamped in English as well as French.
Marks on products are put there to meet regulatory requirements, and to make them more likely to sell.
I have items marked in various languages, some marked in English, some in Spanish, and some in French. Others in Russian (using Cyrillic letters).
Different companies mark things in various ways based on their markets or even tradition. Lots of AKMs were build for export, and if marked in English, someone could get an explaination. In particular, Africa has many English speakers, a legacy of the colonial days.
Military material is often designed for many end uses. I have no doubt that many T-72s in russia have french parts. Some M-1s in the US have parts from foreign countries, particularly the early versions made before all suppliers had their US operations up and running.