  Operator product expansion technique is analyzed in abelian and nonabelian
nonsupersymmetric field theoretical models with confinement. Special attention
is paid to the regimes where nonzero virtuality of vacuum fields is felt by
external currents. It is stressed that despite physics of confinement is
sometimes considered as being caused by "soft" vacuum gluon fields, it can
exhibit pronounced "hard" effects in OPE both in coordinate and momentum
spaces.
