When large numbers of heavily armed terrorists have taken over the Prypiat' area, European governments shook in fear. Soon enough the fear grew even stronger after the terrorists have made contact. They want ten billion Euro in 24 hours or they will blow up the entire Chernobyl nuclear power plant, releasing clouds of deadly, radioactive materials high into the atmosphere all over the northern hemisphere.
To pay such amount of money to the extremists is unthinkable. Frontal attack, however, could not be thought about, either - the terrorists would have executed their plan if they saw attacking forces. There were too many of them and too well equipped for a quick military operation to succeed.