ENThe article is dedicated to the memory of Professor M.K. Treushnikov. The professor was the head of the candidate of law thesis of the author of the article, therefore, the beginning of the article is devoted to the author’s memories of M.K. Treushnikov. Since the main field of scientific research of M.K. Treushnikov is related to evidence and proof in civil proceedings, the main part of the article is devoted to the issues of the standard of proof. On the basis of the comparative method the author analyses how the approach to the standard of proof in Lithuania and Russia changed after 1990, both in legal doctrine and case law. It is concluded that there are many similarities in the standard of proof between Lithuanian and Russian civil procedure law, but there are also differences, which are due both to different legal doctrine approaches to this issue and to different case law. In particular, the author points out that there must be common standards for such cognitive, logical activity, which exist regardless of the legal system operating in one state or another, for there is only one logic. Keywords: objective truth; sufficiency of evidence; standard of proof. [From the publication]