At least 20 people were killed in Russian missile attacks on the southern Ukrainian city of Odessa – including rescue workers who tried to save others but were hit by a second missile, authorities said on Friday. Ukrainian President Volodymyr Zelensky denounced the strikes, which also left 70 injured, as “heinous.” “Two missiles were fired, with the second hitting rescuers and medics who had arrived at the scene of the first strike,” he said, adding that first responders were among the casualties. The civil defence authority said 10 residential buildings were damaged by the explosions. Zelensk…