The U.S. does not "accept" Cuba (or Venezuela), because they are not all-in for capitalist exploitation of their resources. This is expressed in sanctions.

The "new democrats" are owned by corp's who seek profits through the status quo. The "republicans" are owned by the Oligarchy, seeking profits through chaos. Together, they are our one Capitalist Regime of America Party (CRAP).
Three years to replace Dems with Greens.
m.youtube.com/watch?v=umDj...

Actually, the transfer of power is not so peaceful abroad, with Blunderbus Biden allowing our MIC to ramp up our proxy-war in Ukraine so that it is less-stoppable.The DNC is for corporations.The GOP is for Oligarchy. The DNC cannot be reformed. The Greens can. 3 years.

m.youtube.com/watch?v=umDj...

This is 2011. Note: Ukraine was fired up within a month's time after our 20 years of Afghanistan was done. Our MIC is raking in 10's billions of dollars a year, and with Ukraine and our (sponsored) genocide, revenue continues.
What does Russia gain from a prolonged war?
m.youtube.com/watch?v=4j4Q...

The U.S. has couped socialist President Lula with Balsanero of Brasil (recently arrested), the US also has sanctions on Cuba and secondary sanctions for anyone trading with Russia, Iran, ... the US has weaponised the dollar. BRICS+ will address this matter quite effectively.

"Not realistic" but analogous to the West interfering in Ukraine's government and arming Ukraine with NATO weapons. Would the US just accept such similar actions on Mexico, Canada, ... Cuba, ... passively, as you are suggesting Russia should have done? Russia is trying to protect Russia.

Russia has offered multiple peace negotiations. The West has repeatedly negated them. Who wants peace and who is the aggressor here?
Would the US accept Russian/Chinese weapons in a compromised Canadian/Mexican government?

In 1992, Dick Cheney said (after the dissolution of the Soviet Union),"it would be good to break up Russia."In 2014,Victoria Nuland orchestrated a coup to overthrow the elected pro-Russia president.NATO needs to expand to maintain profits.Ukraine is ruled my Azof (Modern Nazis).Russia has resources.

Where's Blunderbus Biden, anyway? 🤪

The West is collapsing and the US is a rogue nation trying to sanction the world. BRICS will solve this self-created problem.

He is worse:
NIH (under Fauci), created an mammalian H5N1 in 2012 (Nature journal) and a SARS2 virus in 2015 (Ralph Barric, UNC-Chapel Hill). R&D was moved to Wuhan & NIH used Peter Daszak's EcoHealth Alliance for money laundering. Daszak was also the WHO origin investigator (nothing here, lol).