Pakistani Prime Minister Imran Khan has been officially welcomed in the Iranian capital, Tehran, by President Hassan Rohani, the official government news agency IRNA reported.
Khan will later on April 22 hold talks with Rohani as well as other senior officials.
He is also expected to meet with Iranian Supreme Leader Ayatollah Ali Khamenei.
Khan arrived in Iran on April 21 on his first official visit to the Islamic republic for talks set to focus on strengthening bilateral ties, fighting terrorism, and safeguarding borders, Iranian state media reported.
The two countries have in recent months accused each other of not doing enough to stamp out militants allegedly sheltering across the border.
The two-day trip started with a stopover in the holy city of Mashhad, where Khan visited the shrine of Imam Reza, who is revered by Shiite Muslims.
The visit comes a day after Pakistan asked Iran to take action against terrorist groups believed to be behind the killing of 14 Pakistani soldiers earlier this month.
Pakistani Foreign Minister Shah Mehmood Qureshi said on April 20 that 15 gunmen wearing military uniforms ambushed a bus in southwestern Balochistan Province on April 18, killing 14 Pakistani Army personnel.
Pakistan's Foreign Ministry said in a letter to the Iranian government that the assailants came from an alliance of three Baluch terrorist organizations based in Iran.
Qureshi told reporters that Khan would take up the matter with Iranian authorities.
Earlier this year, Iran called on Pakistan to take action against a militant group behind a deadly attack on the Islamic Revolutionary Guards Corps (IRGC).
Twenty-seven IRGC members were killed in the February suicide car bombing near the border with Pakistan.
The Sunni Muslim extremist group Jaish al-Adl claimed responsibility for the attack in southeastern Iran.
With reporting by Reuters, AFP, IRNA, and dawn.com
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