Pakistan on Monday condemned the remarks made by Defence Minister Rajnath Singh on the Sindh province, terming them "delusional" and "dangerously revisionist".
In a statement, Pakistan's Foreign Ministry said such remarks revealed an "expansionist Hindutva mindset" that seeks to challenge established realities and stands in violation of international law and the sovereignty of states.
"We urge Mr Rajnath Singh and other Indian leaders to refrain from provocative rhetoric that threatens regional peace and stability," it said.
Islamabad further urged New Delhi to focus on ensuring the security of its own citizens, particularly the "vulnerable minority communities".
"Pakistan is firmly resolved to safeguard its security, national independence and sovereignty," the statement added.
Earlier, speaking at an event in Delhi, Singh had suggested that the Sindh region, which became part of Pakistan during the 1947 Partition, could one day return to India.
Underscoring India's deep civilisational links with Sindh, Singh said geographical boundaries are not permanent. "Who knows, one day Sindh may come back to India," he remarked.
Referring to BJP veteran L.K. Advani, who hails from Sindh, Singh claimed that the Hindus had never emotionally accepted the Partition-induced separation from their homeland.
"Lal Krishna Advani wrote in one of his books that Sindhi Hindus, especially those of his generation, still haven't accepted the separation of Sindh from India," he said.
"Not just in Sindh, but throughout India, Hindus consider the Indus River sacred. Many Muslims in Sindh also believed that the water of the Indus was no less sacred than the Aab-e-Zamzam of Mecca. This is Advani ji's quote," Singh added.