Ukrainian servicemen take part in brigade tactical exercises with combat shooting near Goncharivske village, Chernihiv region, not far from the border with Russia on December 3, 2018. - Tensions between Ukraine and Russia rose on November 25, when Russian forces seized three Ukranian navy vessels and their crew. Ukraine imposed martial law for 30 days in 10 regions that border Russia, the Black Sea and the Azov Sea on November 28. (Photo by Sergei SUPINSKY / AFP) (Photo credit should read SERGEI SUPINSKY/AFP via Getty Images)
