The New York Times reported Thursday that the Biden administration is considering allowing Ukraine to use NATO-provided long-range precision weapons against targets deep inside Russia. Such a decision would put the world at greater risk of nuclear conflagration than at any time since the Cuban missile crisis. At a time when American leaders should be focused on finding a diplomatic off-ramp to a war that should never have been allowed to take place, the Biden-Harris administration is instead pursuing a policy that Russia says it will interpret as an act of war. In the words of Vladimir Putin, long-range strikes...