He cites two legal documents that ties Brussels hands:
1. Association Agreement with Ukraine, Article 276 - picrel #1
For this specific situation: Ukraine can't block the flow of Russian oil.
https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=LEGISSUM:280101_1
https://eur-lex.europa.eu/eli/agree_internation/2014/295/oj/eng
https://publications.europa.eu/resource/cellar/4589a50c-e6e3-11e3-8cd4-01aa75ed71a1.0006.03/DOC_1
2. Council Regulation (EU) 2022/879 of 3 June 2022
Croatia must allow the transfer Russian "seaborne crude oil" via the Adria/Janaf pipeline to us.
https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32022R0879

What we can do, beyond petitioning Brussels:
- stop the diesel export towards Ukraine, this is about the 10% of Ukraine's diesel usage
- block €90 billion relief
- 40% of gas and electricity import of Ukraine comes from Hungary, 3 billion cubic meter's of gas (supplies about 3 million households), and 2 TWh (terawatt-hour) electricity (supplies about 1 million households)

We stopped the diesel export. What Ukraine buys from us is refined from the Russian crude.
We block the €90 billion until either Croatia lets the Russian oil in, or Ukraine restarts the transport.

At the end they claim that Russians did not hit the pipeline it did not get damaged, but they blew up a tank next to the pipeline.
The tank contained oil for Poland. This really sounded like a gossip