In the case of "regulated professions" such as doctors, lawyers or nurses, the degree must be recognized before the profession can be practiced. If the profession is not regulated, recognition is not necessary. But even here recognition improves the chances on the German labor market..
In this information portal of the Federal Government on the recognition of foreign professional qualifications you can enter the respective learned profession of your*your mentee to get information about the recognition in Germany.
Furthermore explains this flyer explains in Ukrainian the steps to be taken for the recognition of foreign professional qualifications in Germany. Refugees can also contact an advice center of the funding program "Integration through Qualification" (IQ) for advice and support. A list of IQ counseling centers in Germany can be found here: Anerkennung_IQ_Beratungsangebote_bundesweit. Many job centers also cover the costs of translating the qualifications.
You and your mentee can get free advice from the Federal Office for Migration and Refugees (BAMF) on the topic of recognition for "working and living in Germany" by calling 030-1815 1111. Unfortunately, the hotline is not available in Russian and Ukrainian.
In order to better understand what is to be recognized, you can refer to the following presentation of the Ukrainian education system:
