"Good morning! Happy morning!" Rabbi Avraham Wolff exclaimed, with a big smile, as he walked into the Chabad synagogue in Odesa on a recent morning. Russian missiles had just struck an oil refinery in the Ukrainian city, turning the sky charcoal gray. Hundreds were lining up outside his synagogue hoping to receive a kilo of matzah each for their Passover dinner tables. The unleavened flatbread, imperative at the ritual meal known as a Seder, is now hard to find in war-torn Ukraine amid the war and a crippling food shortage.