Independent investigations have dismissed the Kremlin's assertion that Wagner Group mercenaries are volunteers not affiliated with the Russian military.
More than 8,000 security personnel protected players and spectators.
Silence over Afghan President Ashraf Ghani's peace plan announced late last month indicates the Taliban is pondering its next move, say observers.
The improved security situation is bearing fruit as Pakistan has scheduled three PSL matches this year: two play-offs in Lahore and the final in Karachi.
The Iranian military's unprovoked shelling of Pakistani soil over the weekend comes days after Iranian Foreign Minister Mohammad Javad Zarif's widely dismissed visit to Pakistan.
Tehreek-e-Taliban Pakistan claimed responsibility for the bombing, which killed at least 10 Pakistanis, including six police officers.
Pakistan's security forces are continuing their drive to eliminate terrorism once and for all, says Interior Minister Ahsan Iqbal.
Only by working together can Pakistan and Afghanistan counter Iran's mounting aggression and nefarious influence in the region, officials and analysts say.
There was a 21% drop in fatalities caused by militants in 2017 as compared to the previous year, according to the Islamabad-based Centre for Research and Security Studies.
The Pakistan Ulema Council (PUC) is raising the alarm against Iran's 'espionage and terror activities' in the region, particularly in regard to the development of Chabahar port.