The Chinese research vessel Shi Yan 1 was carrying out research activities in the Indian waters near Port Blair and was detected by maritime surveillance aircraft operating there. Since laws do not allow foreign countries to carry out any research or exploration activities in the Indian EEZ, Navy warship asked the Chinese vessel to move out of Indian waters.

from Times of India https://timesofindia.indiatimes.com/india/navy-drives-away-suspicious-chinese-vessel-from-indian-waters/articleshow/72342603.cms