A deal on missile defences angers Russia even though they may not work

In the Economist, here

"......Because they are scared of Russia. Within days of Russia’s invasion of Georgia, Poland had agreed to host ten American interceptors. Ukraine offered to link up its early-warning radars and contribute to surveillance in space. The Czech Republic had already agreed to host the missile-tracking radar.

“We have crossed the Rubicon,” said the Polish prime minister, Donald Tusk, as the deal was done. Russia said any country involved in America’s missile defences made itself a legitimate target for nuclear attack. Condoleezza Rice, the American secretary of state, who went to Poland to sign the deal this week, retorted that such threatening language “isn’t tolerable”..............cannot fend off Russia’s huge arsenal, but countries hosting them place themselves under America’s umbrella, in effect becoming part of the defence of its homeland...."