What are both Challah and Kulich?
Kulich: Kulich (Russian: кули́ч ; ] , from Greek κόλλιξ - "kollix", and ultimately Hebrew: חלה‎ ‎ meaning a roll or loaf of bread) is a kind of Easter bread that is traditional in the Orthodox Christian faith and is eaten in countries like Russia, Belarus, Ukraine, Bulgaria, Romania, Georgia, Macedonia, Moldova and Serbia. Challah: Challah ( , ; Hebrew: חַלָּה‎ ‎ "Halla" ] ), plural: challot or challos ) is a special Jewish bread, usually braided and typically eaten on ceremonial occasions such as Sabbath and major Jewish holidays (other than Passover).
i don't know