The Ghaziabad Police arrested the man, Naveen Pal, and charged him with espionage based on information from the Intelligence Bureau (IB).
Pal allegedly shared confidential information through WhatsApp with a woman he met on social media, said reports
The virtual phone number associated with the woman's WhatsApp account appeared to be from Bareilly in UP, officials said.
However, the IP address was traced to Karachi in Pakistan, they added.
The accused allegedly shared multiple pieces of intelligence about India, MEA documents, and details of G-20 meetings with a person in Karachi through WhatsApp, officials said.