Russia may attack Nato in next four years, German defence chief warnsRussia posing ''very serious threat'' to West, says German defence chiefGen Breuer was speaking on the sidelines of the Shangri-la Dialogue, a defence summit in Singapore organised by the think tank International Institute of Strategic Studies. Members of the Western alliance Nato need to prepare for a possible attack from Russia within the next four years, according to Germany's chief of defence. Many have long feared an attack on a Nato state as it could trigger a larger war between Russia and the US, which is a key member of Nato. Under Article 5 of the Nato agreement, any attack on a member state would mean other members must come to its defence. He pointed to Finland and Sweden's decisions to join Nato shortly after the Ukraine war began.