In today’s tense geopolitical context, certain countries seek to sway other states’ policies in their favour or destabilise their societies. This activity is known as foreign information manipulation and interference (FIMI). In the fifth article of this five-part series on countering foreign interference, Reporters Without Borders (RSF) provides practical recommendations to help journalists verify sources, cross-check claims and build evidence-based reporting, particularly when sources themselves may be manipulated.