Meddling is involving officials from a government into the process, providing support (through financial or state powers) to a specific candidate. Anything related to a 3rd country's political body participating directly (or indirectly) in the electoral process is meddling.
> "Election meddling (or foreign electoral intervention/interference) by a foreign country is any action by a foreign government, or its agents, aimed at influencing, undermining, or disrupting the electoral process of another sovereign nation."