KYIV, Ukraine (AP) — Ukrainian and British officials say Russia suffered heavy losses when Ukrainian forces destroyed the pontoon bridge enemy troops were using to try to cross a river. That’s another sign of Moscow’s struggle to win decisive victories and salvage a war gone awry. Russia’s campaign in Ukraine’s east is making faltering progress. Ukraine’s airborne forces command has released images of what it said was a damaged Russian pontoon bridge over a river and several destroyed or damaged military vehicles. The command said its troops “drowned the Russian occupiers.” Britain’s Defense Ministry said Russia lost “significant armored maneuver elements” of at least one battalion tactical group. Ukrainian authorities opened the first war crimes trial of the conflict Friday.