  We propose an improvement of the Diakonov-Petrov Effective Action on the
basis of the Lee-Bardeen results for the quark determinant in the instanton
field. This 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.
