n a rare diplomatic snub, President Obama is canceling plans to meet with Russian President Vladimir Putin in Moscow next month. The decision reflects both U.S. anger over Russia's harboring of National Security Agency leaker Edward Snowden and growing frustration within the Obama administration over what it sees as Moscow's stubbornness on other key issues, including missile defense and human rights. Obama will still attend the Group of 20 economic summit in St. Petersburg, Russia, but a top White House official said the president had no plans to hold one-on-one talks with Putin while there. Instead of visiting Putin in...