Russian president Vladimir Putin visits China; U.S. secretary of state John Kerry travels to Mexico; and the European Parliament elections begin.

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.

The European Council holds a summit in Brussels; three years passes since the death of Libya's al-Qaddafi; and World Polio Day takes on a new importance.

Parliamentary elections take place in Ukraine; Brazil holds a presidential run-off election; and regulators release stress test results for banks in the European Union.

Greece holds snap presidential elections; the Japanese parliament also holds elections; and the European Council holds a summit in Brussels.