New Delhi, April 16 -- Ukraine's top diplomatic priority is securing allies' help to buy and build more air defense systems, President Volodymyr Zelenskyy said Wednesday between meetings with European leaders, as Russia warned that European sites that make drones and other equipment for Ukraine were "potential targets."

Russian strikes hit more than a half-dozen areas of Ukraine behind the front line on Tuesday and Wednesday. An 8-year-old boy was killed in the central Cherkasy region and a woman was hit in southern Zaporizhzhia, according to Zelenskyy and local officials.

"Every day we need air defense missiles - every day Russia continues its strikes," Zelenskyy said in a post on the Telegram messaging app.

With no plans announced fo...