No Arms Control

John Bolton’s appointment as national security adviser to President Donald Trump is the latest blow to hopes for a less confrontational U.S.-Russia relationship that would include new talks on arms control. Mutual trust is now hanging by a very thin thread.

One wag suggested to me that the Bolton appointment should not really come as a surprise, since it fits the recent Washington pattern — if White House chaos can be considered a pattern. For Kremlin leaders, though, White House zig-zags are...