Tech as Russia? Why not build a carrier while you’re at it? With the no move for russia on T1, if you don’t put every single piece and build in Karelia except for 1 infantry in the Caucus you’re asking Germany to hammer you. Even if you do it’s about a 50/50 battle for Karelia…
Seriously though, if you are winning why bother with techs? If you can see the writing on the wall and you know it’s a matter of time then perhaps you might roll for techs in particular if you have air power. I was the USA and had a fleet of transports weakly defended but out of range of german air, the germans got long range and all of a sudden that fleet was in range and was sunk. The germans knew it was a matter of time once the convoy system got started to norway that he was doomed,