Mission Alaska? 4 Russian warships & 3 Chinese naval vessels sail near U.S in a single formation

The U.S Coast Guard patrol boat first came across a Chinese guided missile cruiser. The Chinese Navy ship was spotted sailing around 138km north of Alaska's Kiska Island. A U.S C-130 Hercules provided air support; it turned out the Chinese ship wasn't alone. 2 other Chinese naval ships & 4 Russian naval vessels were spotted in single formation. One of the four Russian naval ships in the formation was a destroyer. The U.S boat observed as the Russian & Chinese ships broke formation & dispersed.