Union State

Meeting of the Supreme State Council of the Union State: Russia-Belarus

http://en.kremlin.ru/events/president/news/67066 November 4, 2021 Sevastopol Documents signed during the meeting included the Decree of the Supreme State Council of the Union State that sets forth the Guidelines for Implementing the Provisions of the Treaty Establishing the Union State in 2021–2023. Also, following the meeting,

President of Belarus clarifies his position on future relations with Russia

Alexander Lukashenko, The President of Belarus has given a clear indication of where his loyalties lie and where the interests of his country lie. In a word: Russia.
Many tend to exaggerate the materially impactful nature of the occasional disagreements Minsk has with Moscow. The gas disputes of 2004 and 2007, were quickly resolved and relations between the two countries which form a successful Union State, continued along normal lines, thereafter.

Would an attack on Belarus mean an attack on Russia?

The only document which NATO members violate more frequently than the Charter of the United Nations, is the NATO Charter itself.
NATO is supposed to be a defensive alliance, but recent years have shown it to be an aggressive organisation which has famously targeted two states which neither threatened nor bordered any NATO member. Furthermore, they didn’t threaten anyone else, NATO member nor otherwise. The two countries in question are of course Yugoslavia in 1999 and Libya in 2011.