There has never been a time in the history of the United Nations when its leader could be more useful in taking an active role in curing the world’s ills. African terrorists, warlords, revolutions, authoritarianism and a million other plights threaten to destroy international peace and stability. In all of this, where is the secretary-general? Former secretary-general Kofi Annan was more of a general and less of a secretary when it came to public diplomacy and social engagement. Ban is more of a secretary and less of a general.

The revival of Cambodia’s rich and unique cultural heritage has fueled the country’s impressive recovery from the Khmer Rouge’s genocide of 1975-79. This message rang unmistakably true as the Season of Cambodia (SOC) has dazzled New York audiences in museums, universities, galleries, and performing arts centers over the past month.

A perennial question about public diplomacy is, “Does it work?” Congress quite rightly asks that whenever budgets are being scrutinized, and public diplomacy practitioners do their best to provide definitive answers. This can be difficult because only a late harvest will discover all the fruit of public diplomacy. Student exchange programs, for example, may have greatest effect decades later, when the former students have become government officials.

I think Syria is a humanitarian disaster of increasingly enormous proportions -- there have been probably 100,000 killed or missing, 1.4 million pushed outside of Syria, notably in huge refugee camps in Turkey and Jordan, and we probably have one million internally displaced. From a NATO perspective, our first concern is protecting the border of the alliance -- the Turkish border along the north of Syria. We deployed Patriot missiles there, and they are currently protecting millions of Turkish citizens.

There are about 20km (12 miles)—and lots of checkpoints—between the official residence in Jerusalem of Binyamin Netanyahu, the Israeli prime minister, and the headquarters in Ramallah of Mahmoud Abbas, the Palestinian president. This week, as both leaders made simultaneous official visits to China, care was taken to keep a much greater distance between them. Their itineraries put them in different cities at all times.

The two major powers' joint announcement that they would try to bring together representatives of President Bashar al-Assad's government and the rebel forces fighting to oust him represents their first serious diplomatic initiative in nearly a year. After lengthy talks in Moscow on Tuesday, the United States and Russia said they would try to breathe life into a carefully negotiated agreement they both endorsed in June 2012 that left open the question of whether or not Assad must leave power.

The State Department is about to lose yet another Under Secretary for Public Diplomacy and Public Affairs. As reported last week, Tara Sonenshine, who has been in the post for 14 months, is planning to leave the job on July 1. Sonenshine came to the job with an impressive media, foreign policy, and administrative background, and has been an enthusiastic advocate for U.S. government public diplomacy.

From 22 to 30 March, Chinese President Xi Jinping paid state visits to Russia, Tanzania, South Africa and the Republic of Congo, and attended the Fifth BRICS Leaders' Meeting. On the way back, Foreign Minister Wang Yi briefed the accompanying journalists about the president's visit.