I like it =) However even with the Russian fighter, a German force of 2 inf + 2 tank + 1 fighter + 1 bomber will take Anglo-Egypt on average. It can tip the luck in your favor sometimes but on average it still isn’t enough.
If I’m feeling really aggressive against Germany I will instead attack Norway, Ukraine, and West Russia. The success rate isn’t high but it’s above 50% and it gets rid of 2 German fighters, making it really hard for him to get rid of the med fleet and invade anglo.
Your buy sounds ok. It’s not bad to purchase 1 fighter for Russia to help do those little border skirmishes but yeah mostly infantry and a tank here and there is best.