President Biden told allies Friday he was approving plans to train Ukrainian pilots on U.S.-made F-16 fighter jets, according to a senior administration official, as leaders of the world's most powerful democracies worked to toughen punishments on Russia for its 15-month invasion of Ukraine. The Group of Seven leaders are meeting in Hiroshima, with Ukrainian President Volodymyr Zelenskyy set to take part in their summit on Sunday. The green light on F-16 training is the latest shift by the Biden administration as it moves to arm Ukraine with more advanced and lethal weaponry, following earlier decisions to send rocket launcher…