evidence: By firing on the Ukrainian naval ships in international waters, by treating Ukraine’s sailors as civilians rather than members of a sovereign state’s armed forces, and by basing these actions on its claimed annexation of Crimea and its territorial waters, Russia violated international law, the laws of armed conflict, and a 2003 bilateral agreement in which Russia and Ukraine agreed to share sovereignty and control over the Sea of Azov and the Kerch Strait. Russia argues that it now has sole sovereignty over the strait; most of the world disagrees.