1) Telnyashka (Telnik), initially unofficially, introduced by Vasily Filippovich Margelov. In WW2 he was in marines, after he was command vdv division, so he continued the tradition of marines. But colors of the stripes was different. The Navy for a long time resisted the official introduction of Telnyashka (damn how stuped that sound when using in eanglish text) in the uniform of the airborne. So yes there connection to the Soviet Navy.
2) This stupid tradition was born from hooligan tricks of drunken morons. But they are trying to justify it with all sorts of Orthodox rites. Elijah the prophet is considered their patron, as well as the patron saint of thunder and rain. August 2, according to belief, the last day when you can and should swim in water.
And I think that this tradition came from the beginning of the 90s, when the army was in a terrible state. From hopelessness, people were drinking, and drunk people are always engage in vandalism. To the credit of the VDV, I must admit that this tradition is slowly dying off.
3) I can't say for sure, but it is possible that there is a connection with the Navy too.
4) I cant say - I do not know.
5) I dont know. I think - to get to theVDV you must have at least Russian citizenship.
6) Man ..... I don't want to hurt you somehow, but most people do not care, I don't even remember when I read about Bulgaria in the news last time. About whether you can join the Airborne Forces - you should ask this question to people who are directly serving there.But I can give you advice. Any foreigner who says that Russia is cool is taken in our country with pleasure. Our people love foreign flattery. Sometimes it just comes to the point of absurdity
7) Only nurses, telecom operators or parachute handlers. Recently, they may have officer ranks.
8) They are considered elite, but not the same as special forces. If you dig deeper, they are cannon fodder delivered by air. But this definition will hurt them. Maybe this is just my opinion. But I need to clarify that even in the ranks of the VDV there are special units and they are really elite.
9) They treat this differently. If we are talking about any drunken civilians in uniforms, then the attitude towards this is negative. If these are children or women, then most likely they are the families of the paratroopers themselves.
10) I dont know. But I think it is possible. What else should a soldier do after leaving the army. PMCs pay well.
11) I dont know. These is special questions, and I didn't even serve in the army.
I told you what I know. But don't forget that I am only civilian