By Matthew Chapman On Monday, former Gen. David Petraeus told CNN’s Jake Tapper that a key Russian military official is feeling the heat for the ongoing failure of the invasion of Ukraine. “We’re told that the chief of staff for the Russian military recently visited Ukraine, including the Donbas region,” said Tapper. “The U.S. says it isn’t sure why he traveled to the Russian front lines. What do you make of that?” “Well, he’s probably trying to figure out what is going on, why can’t we make progress?” said Petraeus, who previously headed the CIA. “He’s down there trying to work with the comma…
