Here’s what we know, and what we don’t know, about what lies beneath the battle for Ukraine

President Joe Biden on Wednesday pledged an additional $800 million in aid to Ukraine, following Ukrainian President Volodymyr Zelenskyy’s calls for a U.S. or NATO-led no-fly zone. It would be understandable, but a mistake, to think American support is limited to what we can see. Ukraine playing the role of David against Russia’s Goliath is impressive optics, but it’s not happening in a vacuum.

From my experience as head of counterintelligence at the FBI, I know that it’s likely that U.S. spies and spy-catchers have been hard at work providing Zelenskyy with advantages that may never see the light of day. We may never know the secrets regarding this silent war for Ukraine, and I’m OK with that.