Approximately two-thirds of Danish voters have backed abandoning the country’s 30-year-old opt-out from the European Union’s common defence policy in a referendum, the latest example of a European country seeking closer defence links with allies in response to Russia’s invasion of Ukraine. “Right now, we are the only country that cannot contribute [on defence] and we are not allowed to take responsibility for European cooperation in this area,” Prime Minister Mette Frederiksen said on Tuesday ahead of the referendum, “even in a situation where there is war on our own continent”.