The U.S. Coast Guard encountered a flotilla of Chinese warships 46 miles off the Aleutian Islands at the end of August, inside of the U.S. Exclusive Economic Zone, according to APM.

The Coast Guard said the four Chinese warships included a guided missile cruiser, a guided missile destroyer, a general intelligence vessel and an auxiliary vessel.

No interaction occurred between Chinese vessels and American Coast Guard or American fishing vessels, according to the Coast Guard’s release. It said the Chinese vessels have right of passage through the economic exclusion zone, and were in full compliance with international maritime law.

Scott McCann, a Coast Guard spokesperson, said it’s been several years since Chinese warships last entered the economic zone off Alaska.