ISRO’s Chandrayaan-2 and NASA’s Lunar Reconnaissance Orbiter (LRO) orbit the Moon in a polar orbit.
Both Orbiters came close to each other.
Chandrayaan-2 Orbiter has been orbiting the Moon for the last two years.
Both, ISRO and NASA agreed to a collision avoidance manoeuvre (CAM) to avoid the collision of both their Orbiters.
Collision avoidance manoeuvres (CAM) are a common thing for satellites in Earth orbit to avoid them from colliding because of space objects including other satellites and space debris.