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1. The Russians were leasing the naval base in Crimea, so they were allowed to be there. legally. There was no occupation.
2. Crimea historically never truly belonged to Ukraine. Especially since the Crimea handover was unconstitutional.
3. If you're going to go as far back as the USSR to point fingers, then you might as well go further and tell me about the crimes of Ivan The Terrible and pin that on modern Russia as well.
As I already mentioned, the Russians were already there. What did you expect them to do? Sit back or retreat while the temporary government in Kiev would decide to use army and aviation to restore control against Pro-Russian Separatists the same way as they did in Donbass area? Or was that not what you would refer to as "bloodshed"?
The Russians decided to protect their own people. And to give them a choice. The Crimeans made their choice. After a coup d'etat the constitution validity is suspended so the referendum was a valid expression of public opinion. And if you think they are now all keeping quiet about their true thoughts because they fear Putin, then you are mistaken. Im not hearing anyone complaining. The Uyghurs in China had their mouths sown shut by the CCP. Yet we heard a lot of brave Uyghurs complaining about how they were being treated, despite being threatened with death and camps.
You seem to have swallowed the western propoganda of Putin being Hitler reincarnated, hook line and sinker.
Here is a video you should look into, if you want to inform yourself:
Why is Ukraine the West's Fault? Featuring John Mearsheimer