Wich one should I learn between russian and arabic?
Arabic has many more speakers and is spoken in many countries (although Russia is still strong in the former Soviet Union as a lingua franca), but with Arabic because it is such a variety different dialects and often incomprehensible that the outside area of the dialect that you learned it would be useful to read the street signs are not included (from what I heard). Arabic has a lot of sounds complex and confusing system of writing, unless you have a particular reason for learning Arabic (ieyou have many clients in the Middle East or do business), you may want to stick with Russia. Russia also has an alphabet that is used by many other languages and can give you the opportunity to better understand some related languages.
I guess both would be preferable, but if u can not Arabic is preferable, and why Arabic because there are about 23 Arab countries in addition to other Muslim countries almost 40 countries that are also very familiar with Arabic, with a total population of a billion .. while Russian is spoken in 9 or 10 countries (nearly 350 million)..
Unless you have direct contact with a particular part of the world in Arabic, Russian is the answer.
The reason is that Arabic is a general term for a multitude of dialects and languages. The only reason we still use the Arabic word is religion. If it were not Islam, we would already be using different terms to distinguish between Moroccan Arabic, Levantine Arabic, etc. Because these people do not understand eachother, they are in fact different languages. Standard Arabic usually taught, what is understood by most, is an artificial language that nobody really talks.
On the other hand, the Russian language is fairly uniform with a long literary history.
I think it would be better if you learn Russian. Russia is a better and richer and say you have a customer of Russia, it will certainly afford to pay you a customer Arabic. I know this is not a solid basis, but it's one to consider....

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