US approval of F-16 sale to Ukraine raises concerns for Russia.

The Biden administration has agreed to support an international coalition to train Ukrainian pilots on Western fighters, paving the way for modern jets to one day be transferred to the front line. The decision on jets is the latest move in what has become a familiar pattern of incremental military aid to Ukraine. Secretary of State Antony Blinken was a key driver in convincing Biden to relent on the F-16s, a U.S. official familiar with the issue said. The administration's incremental approach is part of a calculated strategy to get Ukraine the capability it needs quickly on the battlefield, and to prevent escalation.