He also noted that inimical intentions of the country's adversaries are being strengthened by radicalism.
"Security situation in the immediate neighbourhood is extremely fragile and it is a major concern for us... the need of the hour is air vigilance," the Air Chief Marshal said in his address at the 79th Air Force Day parade here.
In his Air Force Day message, the IAF chief said the "present environment in our neighbourhood is a serious cause of concern and warrants close monitoring and eternal vigilance."
"Today the inimical intentions of our adversaries are further strengthened by radicalism and infusion of technology," Browne said.
The IAF Chief had recently said that Pakistan continues to reel under relentless terrorist violence and stabilisation of internal security situation there appears a distant dream.
He had also said that increasing presence of China in Pakistan occupied Kashmir (PoK) warrants India's "attention".
Stressing on ensuring the security of all important assets of the country, the IAF chief said that security of our information networks was also "absolutely critical".
"We need to upgrade our knowledge and awareness to counter this threat," he said.