Ukrainian President Volodymyr Zelenskyy on Saturday urged the West to deliver more air defense systems after at least six people were killed in the latest Russian strikes. Ukraine is currently on the back foot in the two-year war as a crucial $60-billion aid package is held up in the U.S. Congress. Kyiv also appeared to have had launched its own overnight drone attack that damaged a residential building in Saint Petersburg, Russia's second city. Kyiv has admitted it is heavily outgunned and outnumbered, facing ammunition shortages amid aid delays. Half of all promised Western ammunition arrives in the country late,...