The first is formal NATO membership for Ukraine, and the second is the so-called Israel option , which would entail building up Ukrainian military power with continued Western military aid—so that Kyiv’s strength and bristling arsenal alone can deter Russian aggression. The first is formal NATO membership for Ukraine, and the second is the so-called Israel option, which would entail building up Ukrainian military power with continued Western military aid—so that Kyiv’s strength and bristling arsenal alone can deter Russian aggression.