WASHINGTON (NEWSnet/AP) — A U.S. Navy submarine arrived in Guantanamo Bay, Cuba, on Thursday in a show of force as a fleet of Russian warships gathered 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, a day after a Russian 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.

Other U.S. ships also have been tracking and monitoring the Russian drills, which Pentagon officials say do not represent a threat to the United States.

“This is not a surprise. We’ve seen them do these type of port calls before,” Pentagon spokeswoman Sabrina Singh said Wednesday when asked about the Russian drills. “We of course take it seriously, but these exercises don’t pose a threat to the United States.”

The exercises, however, come less than two weeks after President Joe Biden authorized Ukraine to use U.S.-provided weapons to strike inside Russia to protect Kharkiv, Ukraine’s second-largest city. Russian President Vladimir Putin then suggested his military could respond with “asymmetrical steps” elsewhere in the world.

Singh said seeing more Russian activity around the United States in such global exercises wouldn't be a surprise. 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.

Russia is a longtime ally of Venezuela and Cuba, and its warships and aircraft have periodically made trips to the Caribbean.

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