By Asif Shahzad and Gibran Naiyyar Peshimam ISLAMABAD (Reuters) -Pakistani Prime Minister Imran Khan on Thursday rejected opposition calls for him to resign, and accused an unnamed Western country of backing moves to oust him because he had visited Moscow recently for talks with President Vladimir Putin. Khan, 69, has faced mounting criticism of his performance, including his management of a troubled economy of the nuclear armed country. On Sunday, he faces a tough parliamentary no-confidence vote https://www.reuters.com/world/asia-pacific/pakistan-pm-khan-faces-difficult-no-confidence-vote-20…