Britain’s defence secretary said Tuesday that Russia’s war on Ukraine has been a “wake-up call” for NATO members, making them realise that their militaries need to be better and invest more in defence. British Defense Secretary Ben Wallace said many nations in Europe had become complacent after the collapse of the Soviet Union, and that Russian President Vladimir Putin has become “in a sense, a gift to NATO.” He spoke during a panel discussion at the Warsaw Security Forum, a two-day gathering of trans-Atlantic leaders, security and defence experts. Conference attendees included Ukraine’s first…