The Nordic country will become NATO’s 31st member on Tuesday, expanding the alliance in a strategic setback for President Vladimir Putin of Russia. (snip) Finland’s flag is being raised on Tuesday afternoon at NATO headquarters, a deeply symbolic moment marking the Nordic nation’s official welcome into the alliance and the shifting power calculations as the West strengthens its allegiances in response to the war in Ukraine. The president of Finland, Sauli Niinisto, is expected to attend the ceremony, on the North Atlantic Treaty Organization’s 74th anniversary, in what amounts to a strategic defeat for President Vladimir V. Putin of Russia,...