The Defense Department has begun planning for long-term military assistance to Ukraine, setting the stage for Congress to appropriate more funding for what Pentagon officials say will be a multiyear commitment. Last week, DOD unveiled its biggest tranche of security assistance to Ukraine to date, announcing intentions to put $3 billion under contract to deliver surface-to-air missiles, long-range artillery, laser-guided rockets and various drones to help stave off the ongoing Russian military invasion. The contracts will be funded under the...