Russia could force a war with Britain in a matter of weeks by attacking a Nato member, US officials have warned. Intelligence officials in the US had previously claimed Russia would not attack another nation while it was still fighting in Ukraine. Setting his sights elsewhere, President Putin has conducted probing attacks on Nato nations, such as Estonia, Lithuania, Latvia, Romania and Poland. Straying drones from Russia have become a frequent occurrence in eastern Europe since the Ukraine war began in February 2021. A Russian attack on a Nato nation while the Ukraine war plays would break the alliance, US officials warned.