SERGEI PROTOSENYA, 55

WHO: Former deputy chairman of Novatek, Russia’s largest independent natural gas producer, with net worth over $433 million.

WHEN: April 19

WHERE: Found hanged in the garden of his luxury rental villa in Spain with no suicide note. His wife, Natalya, 53, and daughter Maria, 18, were found hacked to death in their beds — with an ax.

WHY: The gruesome assassination staged to look like a domestic violence murder/suicide was another bloody message to Putin’s inner circle to guard the dictator’s secrets — and his money — as Western countries seek to freeze Russian assets over the Ukraine war.