A collection of photographs that Ukraine says shows the presence of Russian forces in the eastern part of the country, and which the United States cited as evidence of Russian involvement, has come under scrutiny. The photographs were submitted by Ukraine last week to the Organization for Security and Cooperation, an organization in Vienna that has been monitoring the situation in Ukraine. Some of the photographs were also provided by American officials to Secretary of State John Kerry so he could show them when he met in Geneva last Thursday with his counterparts from the European Union, Russia, and Ukraine....