The heads of nine European NATO members on Sunday issued a joint statement backing a path to membership for Ukraine in the U.S.-led security alliance, and calling on all 30 NATO nations to ramp up military aid for Kyiv. Ukrainian President Volodymyr Zelenskyy made a surprise move Friday to apply for fast-track NATO membership, in response to Russia’s annexation of four regions of Ukraine. NATO membership needs approval from all 30 members and Ukraine is unlikely to join anytime soon. Being a country already at war complicates the request. The nine NATO countries in Central and Eastern Europe fearful that...