
September 2012 – US President Barack Obama calls off his trip to the APEC summit in Vladivostok due to his taking part in the Democratic National Convention, a key event in the presidential race.
May 2013 – Russian President Vladimir Putin decides not to take part in the G8 summit at Camp David, as he is busy forming a government following his inauguration. He instead delegates Prime Minister Dmitry Medvedev to attend the summit.