Russian invasion of Ukraine

Dangerous times to be a Russian energy boss! From BBC

Several Russian energy oligarchs have died in unusual circumstances in recent months:

The body of millionaire Novatek former manager Sergei Protosenya was found alongside his wife and daughter at a Spanish villa in April
A former vice-president of Gazprombank, Vladislav Avayev, was found dead with his wife and daughter in their Moscow flat, also in April
In May, a former Lukoil tycoon Alexander Subbotin died of heart failure, reportedly after seeking alternative treatment from a shaman.