I know it was interesting for me too, 10 years ago. so I started to learn it.. now I can write in arabic as well and read somehow, without diacritical marks. Regarding english or german.. you're right, nothing like that. But regarding russian - who knows, who knows.. Following the last researches made by prof. Fomenko and prof. Nosovsky from the Russian Science Academy, there was a period in Russia when russians lived messed together with tatars and "mongols".. and arabic language was spoken by them all, as well as russian. Maybe it's true. I believe in that If so, there should be many mutual infiltrations and entries in both the languages.. Nobody says arabic is russian, or whatever, but it seems that russian have much more "arabic" points than any roman or german language..
Tartar language has experianced Arabic influence in a slightest manner, when tartar states were independent and had cultural and religuous connection with Arabic world. After Ivan IV (the Terrible) conquered Kazan and other khanates, Russian started influencing all the minor langueges within Great Dutchy of Moscow and then, Tsardom of Russia, Russian Empire and in the Soviet Union conseqyuently. It had never experinced Arabic influence it does not even have any single morpheme which might have substituted native slavic morphemes, so I guess such point of view is scientifically incorrect. Though, Russian was influenced by Tartar language in some extent, but Tartar is Turkic language. Moreover, you are mistaken saying "russian have much more "arabic" points than any roman language." Just check Portugues or Spanish and you'll find that 30% of their vocabulary has Arabic origin, and it doesn't come as any surprise due to the fact that Iberian peninsula was ruled by Arabic world for more or less 800 years.
and what's regarding the much famous artifacts of Russian history which have Arabic texts written on them? how do you explain such a rare old texts (prays) which have pure Arabic words or sentences inserted in the middle of Russian text? I never researched by myself these texts, but sounds pure Arabic (not Turkish-like). of course, Russian have some influence of Turkish languages.. but beside this, I think there may be a large period of time when Arabic language was spoken in Russian tsardom. not Tartar language, which is a child of Turkish..
I have never heard about Arabic texts in the middle of Russian tsardom, I goodled it, and found no references at all, mixing medieval Russia with something else? Do you imagine what territories Russia, or it would be more correct to say, First Russian Tsardom occupied before converting itself into Empire? It was really small. There are some Arabic texts on tomb stones in Bashkiria, Chechnya and other republics within the territories of modern Russia where Islam is the main religion. But they never influenced lingustically on the Russian language, even more, Arabic was used there as the language for religious rituals and was never spoken in real life.
Maybe you can draw an example of something of Arabic origin in the Russian language? Taking into consideration that Russian is your mother's tongue and your knowledge of Arabic it won't be a problem for you. Please, this is a really interesting topic to discuss.
oh, sorry, I haven't good opinion regarding arabic textbooks.. all I learned have been found in the Internet. that's my usual way to investigate anything - just go and google it yes, languages are my hobby. can you believe that I never studied english? but it's truth. I studied german at the university, and the rest at home. there was a little period in my life when I teached hebrew.. also, russian is my mother's tongue