If you want to express a similar feeling in Russian, you could try:
* "Ми-ми-ми" (mee-mee-mee): This is a common Russian expression of cuteness, often used to describe something adorable or heartwarming.
* "Какая прелесть!" (ka-ka-ya pre-lest!): This means "What a darling!" or "How lovely!" and can be used to express fondness for something cute.
* "Какой милый!" (ka-koi mi-lyi!): This means "How sweet!" or "How cute!" and is often used for expressing affection towards a person or animal.
Ultimately, the best way to convey the meaning of "Rawr" in Russian depends on the specific context. You can choose the expression that best fits the situation and your intended emotion.