The US says its missile defence system is intended to destroy incoming ballistic missiles potentially coming from North Korea and Iran.
This involves using radars in Alaska and California in the US and at Fylingdales in the UK. Another radar is planned for Greenland.
Anti-missile missiles, or interceptors, are being based in Alaska (40 of them) and California (four).
There would also be 130 interceptors based on ships. The interceptors work by physically hitting the ballistic missile in mid-flight. There would also be missiles to try to destroy incoming rockets in the final stages.
However, the US plans to install 10 more interceptors in silos in Poland, and build a radar station in the Czech Republic.
It hopes that construction of the Czech facility – using a radar currently located at Kwajalein Atoll in the Marshall Islands – could begin next year, with the first interceptors in place in Poland by 2011 and the system fully operational by 2012.
Why in Eastern Europe?
The US says there is a gap in its anti-missile defences.
A threat from North Korea could be countered with the US and sea-based systems.
But European allies or US forces in Europe could be threatened by Iran one day, Washington says, or indeed some other country, so there needs to be a system based in Europe as well.
Will it work?
The theory is that the interceptor missile homes in on and destroys its target in the air by physically hitting the incoming warhead.
However, the closing speed of interceptor and target will be 24,000kph (14,900mph), or 6.5km (4 miles) per second – so the task is more difficult than hitting a bullet with another bullet.
The system’s supporters say that not only does it work, but it is even more accurate than that.
But critics say that, despite having spent over $100bn (£54bn), the Pentagon still has not proved the system can work in realistic conditions.
Independent scientific bodies in the US have said that tests of the system’s intercept capabilities have been highly scripted, with the defence being given detailed information about the attack beforehand.
They also argue that the defence system could be easily circumvented by potential attackers.
Why does Russia object?
The US wants to place radar at this old base in the Czech Republic
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