Russian leader Vladimir Putin says European countries should rethink their calls to let Ukraine use Western arms to strike his country. "So, these officials from NATO countries, especially the ones based in Europe, particularly in small European countries, should be fully aware of what is at stake," Putin told reporters on Tuesday. "They should keep in mind that theirs are small and densely populated countries, which is a factor to reckon with before they start talking about striking deep into the Russian territory," he continued. Putin's warnings come after several European leaders said that Ukraine should be allowed to attack...