You can use software that allows you to create a wallet with a seed phrase of 12 words.
It's not impossible to remember 12 words if they are very important. This way you can keep the wallet in your brain. Also known as a bitcoin brainwallet. No one can steal your thoughts.
In cryptography we trust (& verify).
If we rely on the title of the OP topic, then I don’t think that everything that happens in these two countries will allow a person to calmly remember the phrase. People are so scared and stressed that even if they remain safe, their memory can fail them at any time.