Russians on proposed S54/55, basically a single engine Su30MKI to be used as a light combat aircraft in India and a replacement for L39 jet trainer in Russia.What ? The Al-31 has a dry thrust of ~ 75 KN & a wet thrust of ~ 125 KN . That's a medium weight fighter whereas HLFT is a LIFT / Light Fighter. What's he on about ?
That was sub 10 ton design. HLFT is near 15 tons.
In the current config, you will need 70+kN of thrust.