In recent years, claims on invalid elections have been a major source of conflict. In the USA, claims on "stolen elections" have almost started a civil war. In Ukraine, one claim used by Russia to justify its invasion is that the current regime is a "puppet regime", that is, the elections by which it was chosen were not valid and do not represent the will of the people.
As long as there is an option of stealing an election, every country can claim that the elections in its neigbour were "stolen", and by this, justify invasion in order to "restore democracy".
Question: is there a process by which a country can conduct democratic elections, such that the election results would be internationally recognizable as valid, and there could be no claim of stealing elections? I am considering not only technological means (e.g. cryptographic elections) but also procedural means, such as supervision by impartial parties.