Please keep this in mind:
Putin had been a colonel in the KGB, and after the end of the Soviet Union, a mysterious explosion blew up an occupied apartment building (killing many people) and he blamed it on Chechen separatists. (It is always good to have some third party to blame to deflect suspicion away from you). This was followed by two more apartment building explosions. A fourth building was found to have a large supply of explosives in the basement which hadn’t been triggered yet. Initial reports said that it was a type of explosive often used by the KGB, but the evidence disappeared before investigations could begin. Putin kept insisting that it was the work of Chechen separatists and that only he could save the country. He ran for office and “won” and has manipulated the elections since then, recently having his term in office greatly extended.
He is extremely immoral and sees the deaths of others as his road to continued power. He has also forced oligarchs to “donate” to him if they want to stay in power and out of jail. Perhaps this is why Trump is so enamored of him.