PT Sans
Google Fonts · Alexandra Korolkova · 2009

A rigorous humanist sans-serif built for both Latin and Cyrillic scripts, offering reliable legibility across virtually any context.
About
Commissioned by the Russian Federal Agency for Print and Mass Communications, PT Sans was designed to provide a high-quality free typeface for use across Russian-language publishing and government materials. Its humanist construction lends warmth without sacrificing neutrality, making it equally at home in body text, interfaces, and editorial design. The extensive Cyrillic support and open-source availability make it a practical workhorse for multilingual projects.
Classification
PT Sans is a humanist sans-serif with open apertures and warm letterforms, designed to serve both Latin and Cyrillic scripts with equal care. Its balanced proportions and generous x-height make it highly legible across a wide range of sizes and media.