  We report the detection of three compact ($< 0.001$ pc) radio sources (CRSs)
at K$_{a}$-band (0.9 cm) in the \uchiirs G040.54+2.59 (two CRSs) and
G034.13+0.47 (one CRS). These CRSs have weak flux densities and are located at
the center of their respective \uchii regions. We found no clear association
between massive ionizing stars and CRSs but some radiative influence on the
latter, as suggested by their large emission measures (> $10^7
\mathrm{cm}^{-6}\mathrm{pc}$), typical of photo evaporating neutral objects
close to or associated with massive stars. Our modelling of G40.54+2.59 shows
that their CRSs supply enough ionized material to shape its morphology while
significantly extending its observable lifetime. On the other hand, despite the
possible relation of the CRS with the large-scale outflow signatures observed
in G034.13+0.47, the influence of this CRS on the evolution of the \uchii
region is unlikely. Our results show that the presence of CRSs can alleviate
the so-called lifetime problem of UCHII regions. Still, to address their
dynamical evolution adequately, the scenario must include additional mechanisms
like ambient confinement, or the role of the kinematics of their associated
stellar objects.
