Russia air tree grind

So I recently started grinding USSR air, and i’m currently at rank IV. I was wondering if anyone had some tips of how to grind USSR air faster, like which lines i should research, and what things I should use.

There are no correct way to research a tech tree, nor there’s a exclusive fast way to research a tech tree; that’s why calculators applications, softwares and websites like wtgrind.app and wtrpcalc exist to minimize time wasted on vehicles you don’t need or want to focus on your goal. It doesn’t exactly answer your question but these tools should help.