If I live in a country such as singapore , Thailand or Malaysia where it is impossible to avoid najassat of chinese and indian people. How we do? Do we have to apply the fiqh rule like in China and India?
Because they are everywhere in the society

You should avoid najasat as much as possible. Har time paak rakhna wajib nahi. Namaz paak halat me honi chahiye. Khane me jitna possible ho utna avoid kijiye. Jab problem ho to veg kha sskti hain, nonveg nahi