Astrophysical jets are considered among the most powerful and variable known objects in the universe. VLBI observations provide us ultra-high resolution images which can reveal the innermost structural dynamics of the jet. This knowledge in a combination with the gamma-ray variability of a source gives us the unique opportunity to localize the gamma-ray emission as well as to estimate its distance from the apex of the jet. In this talk, we present a case study of the gamma-ray flaring events which occurred in the compact blazar 2013+370 during 2002-2017. Our ongoing analysis of gamma-ray, 15 and 235 GHz light curves and multi-epoch VLBI imaging from 15 to 86 GHz revealed that the flaring events are clearly correlated with the VLBI-scale jet structure and lead us to a first estimation of the gamma-ray production region.