Historically skeptical about European Union efforts to deepen cooperation, Danish voters on Wednesday will choose whether to abandon the country’s decision three decades ago to opt-out of the bloc’s common defence policy. The Danish referendum comes as the latest example of European countries seeking closer defence links with allies in response to Russia’s invasion of Ukraine. It follows Sweden and Finland’s historic bids to join NATO – something to be taken up at a summit next month.Historically skeptical about European Union efforts to deepen cooperation, Danish voters on Wednesday will choose whether to abandon the country’s decision three decades ago to opt-out of the bloc’s common defence policy. The Danish referendum comes as the latest example of European countries seeking closer defence links with allies in response to Russia’s invasion of Ukraine. It follows Sweden and Finland’s historic bids to join NATO – something to be taken up at a summit next month.