Prime Minister Narendra Modi on Saturday called on Vietnam National Assembly Chairperson Nguyen Thi Kim Ngan here."Afternoon meetings begin with a call on Nguyen Thi Kim Ngan, Chairperson of the National Assembly of Vietnam," External Affairs Ministry spokesperson Vikas Swarup tweeted.Earlier in the day, Modi held delegation-level talks with Vietnamese Prime Minister Nguyen Xuan Phuc following which the two sides signed 12 agreements while giving a strong boost to bilateral defence ties.Modi arrived here on Friday ahead of his visit to China to attend the G-20 Summit to be held on September 4-5.This is the first bilateral prime ministerial visit from India to Vietnam in 15 years since the visit of then Prime Minister Atal Bihari Vajpayee in 2001.