This is the best summary I could come up with:

WASHINGTON (AP) — A U.S. Navy submarine has arrived in Guantanamo Bay, Cuba, in a show of force as a fleet of Russian warships gather for planned military exercises in the Caribbean.

U.S. Southern Command said the USS Helena, a nuclear-powered fast attack submarine, pulled into the waters near the U.S. base in Cuba on Thursday, just a day after a Russian frigate, a nuclear-powered submarine, an oil tanker and a rescue tug crossed into Havana Bay after drills in the Atlantic Ocean.

The stop is part of a “routine port visit” as the submarine travels through Southern Command’s region, it said in a social media post.

We’ve seen them do these type of port calls before,” Pentagon spokeswoman Sabrina Singh said Wednesday when asked about the Russian drills.

The drills are in international waters, and U.S. officials expect the Russian ships to remain in the region through the summer and possibly also stop in Venezuela.

In 2015, a reconnaissance and communications ship arrived unannounced in Havana a day before the start of discussions between U.S. and Cuban officials on the reopening of diplomatic relations.

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