Saturday, it must be Prague – US President Barack Obama and his wife Michelle arrived last night in the Czech Republic ahead of today’s summit with EU leaders.President Vaclav Klaus was on hand to welcome the American leader on his first visit behind the former Iron curtain. This stop over on Obama’s tour of the European continent is not the easiest – the Czech leadership is at odds with aspects of US policy – President Klaus refutes the science behind climate change while prime minister Topolanek has denounced Washington’s stimulus plans. But the obvious tight security has not been organised to keep the politicians apart. Unilateral talks have been kept to a minimum, but one topic is a legacy from the Bush administration. The proposed building of a radar system as part of a US missile defence shield has divided the Republic and provoked demonstrations.