Matt in recent videos (such as today) he talks about false flag events, when and why states use false flags. Today he presented a Telegram post from a woman working for the Press Dept. of the Russian Ministry of Foreign Affairs. The post describes a Ukrainian planned false flag operation against Poland and Romania to create casus belli for NATO to enter the war.
This woman cites "several Hungarian media outlets" that reported about the sabotage.
For now I found one that pointed to another which seems to be the origin of the news. This is Pesti Srácok, I made a screenshot of the relevant part, it's at the end of the article. Link:
https://pestisracok.hu/vezercikk/2025/09/haboru-ukrajnaban-terkep-allohaboru-hazugsag

The core topic of the article is how much territory the RuAF captures in 2025, then the author writes about Ukrainian terror attacks against civilian population, Ukrainian disinformation, then tells a joke, then comes the false flag event.
He introduces it by stating "the wind blows curious news over Telegram". No link to source. And he goes on telling that the SBU plans to organize attacks and bombings in Romania and Poland against logistical hubs where weapons run through to Ukraine. The attacks will be carried out by Russian produced drones, launched from Western-Ukraine. Kiev would follow this up by a media campaign to blame Russia for the attacks. They'd use repaired Gerans intercepted during earlier attacks.

So the sourcing is a bit circular. A Telegram channel points to Hungarian paper which points to a Telegram channel. Well, the latter not really points to anywhere just mentions it, and the first one says "several papers" and I'm not sure the where the link points - since I've no Telegram to check.

Additional information:
Pesti Srácok is a "near Fidesz" media outlet. Their articles written in tabloid, vulgar language, with quite belligerent tones, often resorting to namecalling and whatnot. They are literally for pouring oil on the fire, to stir up emotions.

I think this is a rewritten script based on the recent Gerbera flew ins to Poland. It is possible to do it, so plausible, but is it a reality?