"If (Fico’s party) Smer enters government, we will not send a single round of ammunition to Ukraine," (Fico) recently told supporters. (Before the election, which Smer won)
Zero....his electoral platform was basically "stop helping Ukraine".
There's no upside for an independent Russian resident of Slovakia to be a provocateur and potentially kill their ally, and nothing would reinvigorate weakening Western support for Ukraine than the Russian state attempting to assassinate a European head of state.
Wouldn't be the first time I assumed wrong, but I'm going to wait for better sourcing than the Kyiv Post for this particular story.
They have an existential rational for blaming Russia, as well as an obligation to feed the propaganda narrative for their ongoing war. That's not a criticism as that's what is required of them at this moment, but it's an acknowledgement of why I will wait for additional reporting that isn't sourced from Ukraine, or a single Hungarian journalist on Twitter.