Prosto CH-RU Free is an offline Russian-Chinese-Russian dictionary for Android phones. This app, developed by devhead, is ideal for students and contains over 260,000 dictionary entries in its core version. It offers instant search, highlighting of Pinyin, and ease of use. The best part? It's completely free! The only difference between the core version and the free version is that the latter displays ads.

Please note that the app requires an internet connection to download the dictionary (approximately 120 MB). Also, if your antivirus software flags the app during installation, such as Adware.Airpush, it is not a virus, but rather just airpush advertising content.