One of Vladimir Putin's advisers has left his post due his opposition to the Russian president's policies on the full-scale invasion of Ukraine, it has been reported. Dmitry Kozak, who is of Ukrainian origin, "resigned" from his position as Kremlin deputy chief of staff, according to Russian publication RBC. But the Institute for the Study of War (ISW) said that he was likely pushed from his post following "years of disagreement" with Putin about the Ukraine war. Why It Matters Kozak is said to have opposed the full-scale invasion. His exit from the Kremlin inner circle signals the commitment from...