PT Serif
Google Fonts · Alexandra Korolkova · 2010

A well-crafted transitional serif designed to pair with PT Sans, offering authoritative body text performance across Latin and Cyrillic scripts.
About
PT Serif was developed as the serif companion to PT Sans, sharing its multilingual ambitions and public-service origins. Moderate stroke contrast and bracketed serifs give it a classical feel that suits editorial and long-form reading environments. Its strong Cyrillic letterforms make it one of the more considered free options for bilingual publishing in Russian and other Cyrillic-script languages.
Classification
PT Serif is a transitional serif with moderate contrast, bracketed serifs, and carefully drawn Cyrillic letterforms that complement its Latin counterparts. The design strikes a balance between classical authority and contemporary readability.