In case You don't know: Fico ran on an "Anti-Immigration, Social-Democrat Platform" and is one of the most Pro-Russian Leaders within the EU. Which could be the Reason he got attacked (Its the most likely to Me). However, Fico also has Long-Gooning Connections to the Slovak Mafia and has made Enemies there aswell. Could be that aswell.

RT: https://poa.st/objects/660d749a-95d4-4368-95fb-93d2e1f603f8