5th Gen Russian Fighters

Hello all, since SOC asked about MFI, one thing that always interests me is the thrust and the weight of the new russian fighters/exprimentals…the FAS listed MFi as ~40,000lb weight class while having 2 ~40,000 lbf thrust engines…that’s 2:1 TWR…is this possible with the current russian engines? they made good engines before, but going from engine TWR of ~7.8 to ~10 in one giant leap? I think the S-37 is listed as much heavier than the MFI but still have a TWR ~1.5…now is all this because these are “empty” a/c with no real avionics and equipments in them since these are based on the current flight tests not operational a/c?