The Union Jack is flying at half-mast at Gleneagles in Scotland following yesterday’s blasts in London.World leaders at the G8 summit are determined the attacks will not prevent them from finalising deals on issues ranging from climate change to aid for Africa. They also vowed not to be defeated by terrorism. Italy’s Prime Minister Silvio Berlusconi said that “all the leaders were agreed they would leave the summit with concrete and immediate measures”. “It will be a sign,” he said, “of our determination to fight terrorism.” He said there would be a “well-timed response”. Italy, a leading US ally, is in the firing line. Berlusconi said that his task was to be “vigilant, attentive in the knowledge that Italians do face a threat”. The Russian President Vladimir Putin, meanwhile, said that greater cooperation and solidarity was needed internationally. “What happened testifies again to the fact that all of us are doing too little to unite our forces effectively in the struggle against terrorism.” The German Chancellor Gerhard Schroeder said the attacks were aimed at disrupting the summit agenda: “The terrorists are clearly trying to prevent the summit from dealing with important issues which concern our world; the fight against hunger and poverty, the fight against climate difficulties, not to say catastrophes, all topics that particularly concern the Third World.” Many leaders worldwide have expressed strong support for Britain, calling for greater international unity and further anti-terrorist measures.