In the presented article the problems of interaction between the various branches of Russian
law on the basis of legal principles are considered. The author, examining such concepts as
“interaction” and “interrelation” states the fact that the issue of interaction of branches of
law is considered by almost all researchers only from the position of listing those branches
with which their branch of law interacts. At the same time, the construction of branch
norms without taking into account the principles of the branch, where and the branch,
from which the legal institute is implemented, leads to conflicts. Separate attention in the
work is paid to the views of V.A. Riazanovskii and other scholars on the concept of “unity
of process” in the context of interaction between the principles of various branches of law.
The author examines the interaction of such branches of law as civil procedural law with
civil, family law, arbitration and administrative process. The article draws attention to the
cases of free treatment of the legislator with the category of “principles of law”, which, in the
author’s opinion, leads to significant distortions of the entire branch of law, where principles
not inherent in this branch are wrongly implanted. Studying institutes of law as the main
mechanism of inter-branch interaction, the author comes to the conclusion about the need
for legal regulation of interaction precisely through the principles of a branch of law.
Keywords: interaction; principles of law; branch of law; institute of law; civil procedural
law; civil proceedings; criminal proceedings; administrative proceedings.