  We estimate the contribution of nonperturbative quark-gluon chromomagnetic
interaction to the high energy elastic proton-proton cross section at large
momentum transfer. It is shown that this contribution is very large in the
accessible kinematic region of the present experiments.
  We argue that Odderon which is the $P=C=-1$ partner of Pomeron, is governed
by the spin-flip component related to the nonperturbative three-gluon exchange
induced by the anomalous quark chromomagnetic moment. We discuss the possible
spin effects in the elastic proton-proton and proton-antiproton scattering
coming from the interference of spin-flip nonperturbative Odderon and
nonspin-flip Pomeron exchanges.
