Tom Gjelten

American companies that do business with China make good money. They also lose a lot of money there to cyberthieves, who routinely hack into the computers of the U.S. firms and steal their trade and technology secrets.

The failure of the FBI and the CIA to keep track of Tamerlan Dsarnaev in the months preceding the Boston Marathon bombing has prompted criticism that U.S. law enforcement and intelligence officials ignored important warning signs. The case is reminiscent of criticism leveled at counterterrorism officials after Army Maj. Nidal Hasan's shooting rampage at Fort Hood Texas in November 2009 and after the al-Qaida-directed attempt to blow up a civilian airliner on Christmas Day of that year. In both cases, counterterrorism officials subsequently acknowledged that mistakes had been made.

As investigators look into the Boston Marathon bombings, one crucial question is whether the suspects, brothers Tamerlan and Dzhokhar Tsarnaev, acted alone or had help. The clues might be found in the bombs used.

From what is now known, it appears the brothers assembled a whole arsenal of explosives. Watertown Police Chief Edward Deveau told CNN last weekend that the suspects had at least six bombs, including the two used in the attack and one thrown at police during a shootout.

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ROBERT SIEGEL, HOST:

From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.

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And I'm Melissa Block.

As Venezuela's president, Hugo Chavez thought in grandiose terms, and his country's vast oil riches enabled him to act on his vision. But Chavez died before he had to deal with the flaws in his model, and some hard choices await his successor.

Key to Chavez's notion of "21st Century Socialism" was the redistribution of Venezuela's oil earnings. The country's oil reserves — estimated by the Organization of Petroleum Exporting Countries to be the largest in the world — are worth tens of billions of dollars a year in potential revenue.

You might think alarm bells would be sounding in Washington, given the warnings coming out of North Korea. But when they talk about North Korea, U.S. officials are sounding like exasperated parents responding to a child's tantrum.

At the White House on Friday, spokesman Jay Carney said the United States "would not be surprised" if North Korea actually carries out a missile test.

U.S. government pronouncements about the danger of a major cyberattack can be confusing. The director of national intelligence, James Clapper, and the head of the U.S. military's Cyber Command, Army Gen. Keith Alexander, delivered mixed messages this week while testifying on Capitol Hill.

James Clapper, the director of national intelligence, went before the Senate Intelligence Committee on Tuesday in a bit of a sour mood. He led off complaining that he had to speak publicly at all.

"An open hearing on intelligence matters," Clapper said, "is a contradiction in terms." And then, before getting to any international problems Clapper hit a domestic one: the spending cuts mandated under the sequestration package.

A new round of international talks on Iran's nuclear program is under way in Kazakhstan, where the U.S., Britain, France, China, Russia and Germany are asking Iran to give up any thought of building a nuclear weapon in exchange for relief from sanctions.

Western leaders do not predict a breakthrough, but they say small steps could be taken that would increase confidence on both sides.

Still, it's hard to imagine how such negotiations could proceed with lower expectations for progress.

U.S. companies that have their networks routinely penetrated and their trade secrets stolen cannot be surprised by a new National Intelligence Estimate on the cyber-espionage threat. The classified NIE, the first-ever focusing on cybersecurity, concludes that the U.S. is the target of a major espionage campaign, with China the leading culprit.

There have been security flaws in software as long as there has been software, but they have become even more critically important in the context of cyberweapons development.

With the Pentagon now officially recognizing cyberspace as a domain of warfare, U.S. military commanders are emphasizing their readiness to defend the nation against cyberthreats from abroad. What they do not say is that they are equally prepared to launch their own cyberattacks against U.S. adversaries.

President Obama's nominee to run the CIA has his confirmation hearing Thursday afternoon. The hearing of White House counterterrorism chief John Brennan comes as lawmakers are studying a memo on drone strikes overseas. Robert Siegel talks to Tom Gjelten.

John Brennan, President Obama's choice to lead the CIA, can look forward to a grilling Thursday on Capitol Hill. As Obama's chief counterterrorism adviser, he has been associated with some controversial policies, including the use of armed drones. Brennan's nomination comes before the Senate Intelligence Committee, and members from both parties have their questions ready.

Government agencies do not often acknowledge their own errors, but the CIA has done just that with the declassification of intelligence memoranda on the 1973 Arab-Israeli War.

The documents show that agency analysts, down to the last minute before the outbreak of fighting, were assuring President Nixon, Secretary of State Henry Kissinger and other policymakers that Egypt and Syria were unlikely to attack Israel.