As Democrats Gather, a Russian Subplot Raises Intrigue - The New York Times

Also see Trump & Putin. Yes, It's Really a Thing (TPM), Donald Trump, the Siberian Candidate (NYT), and Clinton campaign — and some cyber experts — say Russia is behind email release (Washington Post)

"Proving the source of a cyberattack is notoriously difficult. But researchers have concluded that the national committee was breached by two Russian intelligence agencies, which were the same attackers behind previous Russian cyberoperations at the White House, the State Department and the Joint Chiefs of Staff last year. And metadata from the released emails suggests that the documents passed through Russian computers. Though a hacker claimed responsibility for giving the emails to WikiLeaks, the same agencies are the prime suspects. Whether the thefts were ordered by Mr. Putin, or just carried out by apparatchiks who thought they might please him, is anyone’s guess."

As Democrats Gather, a Russian Subplot Raises Intrigue - The New York Times