Russia is holding referendums today in four regions of Ukraine, as the Kremlin seeks to formally annex territory it seized after its February 24 invasion. Ukrainian President Volodymyr Zelensky has condemned the vote, which U.N. Secretary-General António Guterres has called a violation of the U.N. Charter and international law.

On Thursday, officials in the Russian separatist-held city of Donetsk said Ukrainian shells killed six civilians, including a teenager. Meanwhile, Russian attacks on the southern city of Zaporizhzhia killed one person and left several others wounded.