 Several NATO leaders are using the word irreversible to characterize Ukraine's path forward in NATO, vowing to support Kyiv once conditions to join the alliance are met. Meantime, President Biden says the 32 NATO members are all taking new steps to bolster their own domestic defense production. We cannot allow the alliance to fall behind. The U.S., Denmark and the Netherlands have agreed to provide American-made F-16s to Ukraine that could be flying this summer.