A crisis in Iraq unfolds as the U.S. considers options; the European Council meets in Brussels; and the United Nations Security Council debates Syria.

South Korea deals with a MERS virus outbreak; NATO holds military exercises in Poland and Pope Francis releases an encyclical on the environment. 

The United Kingdom holds elections and the United Nations hosts a conference on ocean sustainability.

President Donald J. Trump goes to Poland, the Group of 20 meets in Hamburg, and three notable independence days are celebrated.

A preview of world events in the coming week from CFR.org: U.S. president Barack Obama hosts Chinese president Xi Jinping in California and Peru's president Ollanta Humala in Washington; and Defense …