Russia and Ukraine exchanged prisoners for the first time in months on Friday, but any hopes of de-escalation in the war were dashed by attacks from both sides and Moscow boasting of its gains throughout May. Ukraine President Volodymyr Zelensky was meanwhile in Stockholm to sign security agreements with Sweden, Iceland and Norway as the West kept up its support for the country invaded by back in February 2022. The meeting came as the Germany said it had authorized Ukraine to use German-supplied weapons against military targets in Russia. Seventy-five Russian soldiers “who were in mortal dange…