Is the quantum dot at large bias a weak-coupling problem?

We examine the two-lead Kondo model for a de-biased quantum dot in the Coul omb blockade regime. From perturbative calculations of the magnetic suscept ibility, we show that the problem retains its strong-coupling nature, even at bias voltages larger than the equilibrium Kondo temperature. We give a s peculative discussion of the nature of the renormalization group flows and the strong-coupling state that emerges at large voltage bias.