Human Rights in Crimea and the Persecution of Lawyers

I am reading news about the deteriorating human rights situation in Crimea, particularly due to searches, unlawful detentions, and pressure on lawyers. Many people there are groundlessly detained, and lawyers are deprived of the ability to properly defend their clients. Please tell me, what are the real mechanisms for protecting human rights for prisoners or persecuted individuals in Crimea, and what assistance can Ukraine or international organizations provide in such a situation?