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The Obama administration is leaving open the possibility of giving Moscow certain secret data on US interceptor missiles due to help protect Europe from any Iranian missile strike.

A deal is being sought by Washington that could include classified data exchange because it is in the US interest to enlist Russia and its radar stations in the missile-defense effort, a Pentagon spokeswoman said on Tuesday in written replies to Reuters.

No decision has been made yet on whether the United States would offer data about the interceptors' "velocity at burnout," or VBO, said Air Force Lieutenant Colonel April Cunningham, the spokeswoman, but it is not being ruled out.

VBO is at the heart of what Russia wants as the price for its cooperation, said Riki Ellison, head of the private Missile Defense Advocacy Alliance, who has close ties to missile defense and military officials. VBO tells how fast an interceptor is going when its rocket-booster motor fuel is spent and the motor burns out.

Ellen Tauscher, the administration's special envoy for strategic stability and missile defense, held talks in Moscow on Tuesday with Russian Deputy Foreign Minister Sergei Ryabkov, including on missile defense, a State Department spokesman said.

The Defense Department, in its response to Reuters, ruled out giving Russia information on either "telemetry" or US "hit-to-kill" technology.

Telemetry involves the automatic transmission and measurement of data from remote sources to monitor a missile flight. Hit-to-kill is the way in which modern US interceptors, such as Raytheon Co's Standard Missile-3, destroy targets by slamming into them.

The sharing of such data might help salve Russian concerns about the layered shield being built in Europe by the United States and its NATO allies, chiefly to fend off the perceived threat from Iranian missiles.

Questions:

1. What does VBO mean?

2. What is the name of Russia’s Deputy Foreign Minister?

3. The data sharing is likely to fend off the perception of what?

Answers:

1. Velocity at burnout

2. Sergei Ryabkov

3. The threat from Iranian missiles.

（中国日报网英语点津 Helen 编辑）

About the broadcaster:

Lee Hannon is Chief Editor at China Daily with 15-years experience in print and broadcast journalism. Born in England, Lee has traveled extensively around the world as a journalist including four years as a senior editor in Los Angeles. He now lives in Beijing and is happy to move to China and join the China Daily team.