Kalyna Block Cipher
Kalyna is a block cipher that became a Ukrainian national standard in 2015. It supports block and key sizes of 128, 256, and 512 bits. Its structure looks like AES but optimized for 64-bit CPUs, and it has a complicated key schedule. Rounds range from 10-18, depending on block and key sizes.
There is some mention of cryptanalysis on reduced-round versions in the Wikipedia entry. And here are the other submissions to the standard.
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