Measures that can be taken to maintain utmost vigilance along India's international borders include:

• Regular patrolling of border areas to check for any suspicious movement of people or materials
• Deploying advanced surveillance technologies like drones, sensors, and cameras to monitor border activities
• Constructing physical barriers like border fencing and walls to deter unauthorized entry
• Strengthening the border security force and equipping them with advanced weapons, equipment, and training
• Maintaining close coordination and communication among different border agencies to share intelligence and thwart any security threats
• Enhancing diplomatic relations with neighboring countries to address border-related disputes and strengthen cooperation against common security threats
• Improving socio-economic conditions in border regions to reduce infiltration and smuggling activities by creating more job and infrastructure opportunities in these areas.

These measures can help India maintain utmost vigilance along its international borders and ensure maximum security.