Simon Tisdall argues that despite initial hopes following the Cold War's apparent conclusion in 1989, Russia under Vladimir Putin has reverted to aggressive expansionism towards European neighbors. He suggests historical patterns show such "seismic" changes often prove temporary, with previous eras similarly misjudging their uniqueness. Tisdall implies that while Donald Trump may seem impactful now, his legacy might ultimately resemble a fleeting blemish rather than a lasting achievement.