Ukrainian President Volodymyr Zelenskyy 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.The topic came up during Zelenskyy’s discussions with European leaders and NATO Secretary General Mark Rutte at a summit meeting in Armenia’s capital, Yerevan, earlier this week, people familiar with the matter said.While the request isn’t new — Kyiv has been pressing allies to supply air defense systems continuously since Moscow’s full-scale invasion in February 2022 — it’s now more urgent, because Ukraine’s power and heating facilities have become increasingly difficult to sustain after years of Russian airstrikes against civilian infrastructure.