President Joe Biden apologized to Ukrainian President Volodymyr Zelensky for a monthslong delay in aid for his war with Russia during their meeting on the sidelines of D-Day 80th anniversary commemorations.

“We’re not going to walk away from you,” Biden told Zelensky on Friday in Paris, blaming resistance from congressional Republicans for the aid’s uncertainty. “I apologize for the weeks of not knowing what’s going to pass in terms of funding because we had trouble getting the bill that we had to pass that had the money in it. Some of our very conservative members were holding it up. But we got it done finally.”