glittering sports career on hold. he told us he plans to volunteer to fight, though this elite athlete will need some retraining. >> i realize that i can't stop russian missile by my hands. i have to have some skills to be-- to be in the army. if my time will come, i will do what i have to do. >> reporter: ukraine's president volodymyr zelenskyy warned last night that as russian forces withdraw from northern ukraine, they're massing in the east and preparing to strike again. his government wants more help from the u.s. and its applies. colonel henadii sheludko of ukraine's air force told us they need f-15s and f-16s from america to stop russia pummeling this country from the air. >> it's our land. it's our people. it's our children. it's everything we have in this life. >> diaz: holly williams joins us now from dnipro in eastern ukraine. holly, what do we know about