  In this talk we discuss an improvement of the Diakonov-Petrov QCD Effective
Action. We propose the Improved Effective Action, which is derived on the basis
of the Lee-Bardeen results for the quark determinant in the instanton field.
The Improved Effective Action provides proper account of the current quark
masses, which is particularly important for strange quarks. This Action is
successfully tested by the calculations of the quark condensate, the masses of
the pseudoscalar meson octet and by axial-anomaly low-energy theorems.
