By the same logic the entire planet should’ve already sanctioned and embargoed Israel (for what it’s doing in Palestine) and the US for doing the exact same thing as Russia but in Iraq (starting an illegal war) but I don’t see that happening.
Cuba is saying these things because Russia is one of the few countries still willing to trade with them. They’ve been hit by crippling sanctions for decades for doing nothing wrong and they’re trying to find ways to survive. End the embargo and you’ll see that change quite quickly.