Tensions are high as Russia prepares to celebrate its most important secular holiday. Fears about security amid the war with Ukraine and signs of domestic discontent are casting a shadow over annual celebrations in Moscow’s Red Square.

Volodymyr Zelenskiy is asking Western allies to speed up deliveries of air-defense systems and interceptor missiles to prepare for another winter of intense bombing that could prove to be the next critical moment in Kyiv’s battle to resist the Russian invasion.