As the impeachment inquiry hogs the spotlight in Washington, another drama in which Ukraine has a role is playing out more quietly -- and causing concern in Kyiv, which is watching warily as Russia brings its Nord Stream 2 pipeline closer to completion. Members of the U.S. Congress appear unified on the need to stop Russian President Vladimir Putin's $11 billion project to deliver natural gas to Europe via a new pipeline beneath the Baltic Sea. Bills that would impose sanctions on companies involved in Nord Stream 2 sailed through committees in the House of Representatives and the Senate last...