The United States is mounting a large-scale humanitarian operation in Venezuela after twin earthquakes devastated the South American country, putting to the test Washington’s role as the most influential international partner in the country’s post-Maduro transition. US Secretary of State Marco Rubio said Washington was deploying search-and-rescue teams, military logistics and humanitarian help after Wednesday’s magnitude 7.2 and 7.5 earthquakes, which have killed at least 164 people and injured...