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Unfortunatelly \normalfont\normalsize does not solve the problem.

Stefan_K wrote:Hi vitaliy,

welcome to the forum!

You could use \normalfont\normalsize, so you also reset the font family.

Stefan

Thank you I will try (unfortunately cannot try right now).

I created a document having such kind of connected packages:
\usepackage[T2A]{fontenc}
\usepackage[cp1251]{inputenc}
\usepackage[english,russian]{babel}
\usepackage[tbtags]{amsmath}
\usepackage{amsfonts,amssymb,mathrsfs,amscd}
The language of the document is russian. I had to use \footnotesize ...