KYIV, Ukraine — Ukraine’s prime minister has appealed for Patriot missile batteries and other high-tech air defense systems to counter Russian attacks that knocked out electricity and water supplies for millions of Ukrainians, putting Europe on alert Monday to brace for more refugees. Poland’s president said his nation already has seen an increased demand to shelter refugees due to the combination of such attacks coupled with the freezing weather in Ukraine. To defend against further strikes, Shmyhal reiterated previous Ukrainian calls for Patriot surface-to-air missiles — a highly sophisticated system.