On March 9, following Russia’s presidential election, President Obama telephoned President-elect Vladimir Putin to re-establish contact with someone he once publicly described as a man of the past but who will run Russia for the remainder of Mr. Obama’s presidency. Mr. Putin genuinely believes Washington orchestrates Russia’s domestic opposition in order to remove him from power and thereby weaken Russia. That’s certainly not an ideal basis for bilateral cooperation.

 A nuclear disaster, narrowly avoided; Russia still backing Syrian repression

Does Iran pose a direct threat to the U.S. homeland? For years, more than a few policymakers in Washington have taken quiet comfort in the notion that, no matter how vexing a challenge Iran and its nuclear ambitions might be, the Islamic republic remained a distant adversary — one not yet capable of putting America at risk.

Is an Israeli attack on Iran in the offing? Recent weeks have been rife with renewed speculation about the possibility of a military strike on Iran’s nuclear program. Most famously, Washington Post columnist David Ignatius reported recently that no less senior an official than Defense Secretary Leon E. Panetta thinks Israel could bomb Iran’s nuclear facilities by this summer.

For years, the media and the U.S. government have repeated a familiar refrain: that the regime of now-ailing Venezuelan strongman Hugo Chavez, however annoying, poses no serious threat to the national security of the United States. Compelling evidence, however, suggests otherwise. Under Chavez, Venezuela has systematically opposed U.S. values and initiatives throughout the Western Hemisphere and the world in general. It has tried to influence political events in other Latin American countries, sometimes successfully. It has supported guerrilla movements and terrorist organizations in other countries (most notably Colombia). And it has facilitated the activities of drug traffickers active in the region, even as it has destabilized the regional status quo through massive military purchases.

The most dangerous threat to the U.S. from Venezuela, however, results from its facilitation and encouragement of the penetration of the Western Hemisphere by the Islamic Republic of Iran. Since 2005, with Venezuela’s assistance, Iran has created an extensive regional network of economic, diplomatic, industrial and commercial activities, with significant effect. The sum total of Iran’s declared investments in the region now stands at some $20 billion, at a time when the Iranian economy itself is in exceedingly poor condition. The depths of Iran’s involvement in the Western Hemisphere are all the more surprising—and significant—given that there is no historical or cultural affinity whatsoever between Iran and the countries on this side of the Atlantic. Nevertheless, the Iranian regime in recent years has exhibited an unprecedented level of interest and involvement in the region, facilitated by its burgeoning strategic partnership with Caracas.

Is China finally coming around on Iran? For years, Beijing's steady backing has helped the Iranian regime frustrate international efforts to isolate and penalize it for its nuclear ambitions. This month, however, there are heartening signs that China is reassessing its longstanding strategic partnership with the Islamic Republic.

North Korean leader Kim Jong-Il's death has strategists and policymakers asking the same question: What's next? Among some there is a strong sense that a leadership change in Pyongyang represents the best opportunity in decades for North Korea to join the international community as a normal state. Pyongyang stands at a crossroads.

 Equipment quality, personnel problems plague Russia's military;

The sudden death of North Korea's long-serving "Dear Leader," Kim Jong-il, has propelled the world's last remaining Stalinist state back into the international spotlight. In the process, it has refocused attention on one of the most stubborn strategic dilemmas facing the United States.

Is electromagnetic pulse a real threat to American security? On the heels of recent Republican primary debates, the danger to U.S. electronics and infrastructure posed by a high-altitude nuclear blast suddenly has emerged as a campaign issue. So has concerted opposition to it, with both liberal and conservative skeptics ridiculing the idea as an overblown, even fabricated, distraction. Yet there is ample evidence that the danger is both clear and present.