Jailed Russian says Russia's FSB ordered him to hack DNC in 2016
And he has absolute proof that he did it. "Kozlovsky said he feared his minders might turn on him and planted a poison pill during the DNC hack. He placed a string of numbers that are his Russian passport number and the number of his visa to visit the Caribbean island of St. Martin in a hidden .dat file, which is a generic data file."
No big surprise. Our intelligence services already knew in general, if not in every tiny detail, that Russians breached the DNC data. But the key fact here is that he admits the hackers were working for the Russian state, contradicting Putin's protestations to the contrary.