This dataset is identical to the well-known Russian-language news dataset (Gazeta.ru)[
https://huggingface.co/datasets/IlyaGusev/gazeta] by Ilya Gusev.
Therefore, details of the dataset should be sought at this link.
The main differences are two - a single dataset (training, testing and validation have been merged) and column names were changed for the convenience of building a news aggregator.