  We study the leading log infrared behavior of electroweak corrections at TeV
scale energies, that will be reached by next generation of linear colliders
(NLC). We show that, contrary to what happens at typical LEP energies, it is
not anymore possible to disentangle ``pure electroweak'' from ``photonic''
corrections. This means that soft QED effects do not factorize and therefore
cannot be treated in the usual ``naive'' way they were accounted for in the
LEP-era. The nonfactorizable effects come up first at the two loop LL level,
that we calculate explicitly for a fermion source that is neutral under the
SU(2)$\otimes$U(1) gauge group (explicitly, a Z' decay into two fermions). The
basic formalism we set up can be used to calculate LL effects at any order of
perturbation theory. The results of this paper might be important for future
calculations of electroweak corrections at NLC energies.
