In an address to the United Nations general assembly in New York, Khan described the situation in Kashmir as a test for the UN and warned that a conflict between India and Pakistan would have "consequences far beyond the borders".
While not mentioning Kashmir by name, Modi touched on terrorism: "We belong to a country that has given the world not war, but Buddha's message of peace".
He will also highlight the plight of the Kashmiri people who continue to suffer a suffocating lockdown.
"The world has not done anything (on the Kashmir issue) because India has a huge market (of) 1.2 billion people".
The prime minister added that attention would also then be diverted towards Pakistan.
In its clampdown in the Indian-controlled part of Kashmir, which has a Muslim-majority, India flooded the territory - already one of the world's most militarized zones - with troops, imposed severe restrictions on movements, and cut all telephone, mobile phone and internet connections.
Earlier this month, the opening pages of a leaked Pakistan's dossier on Jammu and Kashmir contained the statements made by Congress leader Rahul Gandhi and National Conference (NC) leader Omar Abdullah in the wake of the abrogation of Article 370.
"This was a deeply impassioned, dark and really quite grim speech by Imran Khan railing against the injustices of the world", he said.
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"In this day and age you can not put 8 million people in jail and surround them by 900,000 troops", he said, calling upon the world to realise that such oppression must not be allowed.
Following a suicide attack that killed 40 Indian security forces personnel in Pulwama in India-administered Kashmir, the Indian military conducted cross-border strikes against what it said were training camps for the Pakistan-based group that claimed responsibility for the operation. "And that is the reason why our voice against terrorism, to alert the world about this evil, rings with seriousness and outrage".
PM Imran Khan addresses UNGA session in NY on Friday. The world will face the consequences, he added.
"If a conventional war starts between the two countries, anything could happen ..."
'Space has been an important issue for India certainly in the past couple of decades that are important to India globally, ' she told a private television channel. We know Modi thinks Kashmir is an internal Indian matter.
The conflict over Kashmir began in late 1940s, when India and Pakistan won independence from the British empire and began fighting over their rival claims.
Sharing stage with US President Donald Trump and a host of American lawmakers including from Republican and Democratic parties at Houston on September 22, Mr Modi has said back home everything is fine. While Islamabad has appealed for global intervention from the likes of the U.S., Europe and the U.N., New Delhi has said anything pertaining to Kashmir could only be settled bilaterally.