In the mid-1980s, American intelligence discovered a huge missile- detection and -tracking radar being built by the Soviet Union near the Western Siberian town of Krasnoyarsk.
The Russian president has offered a Russian radar in Azerbaijan as an alternative to the detection and tracking radar slated under the Bush plan for the Czech Republic.
Mr Putin is expected to urge Mr Blair to refuse to allow the US to modernise missile-tracking radar stations in the UK if the White House decides to go ahead with a new missile defence system dubbed "son of Star Wars".
They also use more sophisticated equipment, such a GPS tracking devices and radar, to stalk their prey.
The discussion established that while the B-2 may occasionally be detected by some radars, its stealth technology reduces the radar cross-section of the B-2 to the point where radar tracking of the requisite continuity and accuracy is impossible.
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As part of the strategy, the US will also deploy a radar-tracking station in Japan.
An FAA spokesman said the agency was tracking the airplane on radar, so it knew the aircraft's position during the period without radio contact.
He cites the 1991 visit of an American inspection team to the Pechora radar in the Arctic Circle, when inspectors learned that the radar was passing along target-tracking information to a central command.
The F-35 is by far the most advanced Lockheed jet to date, with updated radar, all-internal weapons, improved tracking systems, 360-degree infrared coverage with a visor readout, and a full-stealth design, not to mention the incredibly capable glass cockpit powered by more than 9.3 million lines of software code, and an overall smoother experience for pilots that could end up spending shifts of 12 hours or longer in flight.
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These include GPS, stereo cameras, radar and Light Detection and Ranging (LIDAR) laser tracking.
Both radar systems were developed and built by Raytheon, providing high-resolution tracking and discrimination of all ballistic threats.
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