Russia is at it again. Find out more

The Yantar, tracked near a Georgia submarine base, carries deep-sea surveillance craft and is capable of cutting underwater cables

An Ohio-class submarine sails out of the base at Kings Bay, Georgia

The US military has been monitoring a Russian military vessel that has been sailing close to a ballistic missile submarine base and underwater transit routes, according to Pentagon officials.

The research ship Yantar, which is equipped with deep-sea surveillance craft and cable-cutting equipment, has been tracked since late August as it moved from the north Atlantic near Canada towards Cuba.
Defence officials have said it is believed to be gathering intelligence on underwater sensors and other equipment used by US nuclear submarines stationed at Kings Bay, Georgia, The Washington Free Beacon reported.
The newspaper said the vessel is part of Russia's underwater reconnaissance programme tasked at identifying undersea communications lines, which could be used to disrupt US military operations.
A senior military official told Fox News the ship was around 300 miles off the US coast, but it "remains in international waters".
When asked if the US had similar intelligence ships off the coast of Russia, the official told the news station: "Of course we do, what do you think all those 'oceanographic ships' are doing, studying whales?"
Kings Bay houses six Ohio-class ballistic missile submarines, each capable of firing 24 Trident intercontinental ballistic missiles, as well as two guided-missile submarines which fire Tomahawk cruise missiles.
In January, another Russian intelligence vessel was spotted in Havana, Cuba, Fox News reported.
And in April, Admiral Bill Gortney - head of the US military's Northern Command - confirmed two other Russian military ships were operating off the US.
It comes after five Chinese warships were detected in international waters in the Bering Sea as US President Barack Obama toured Alaska.
The Pentagon said it was the first time the US had seen Chinese ships in the Bering Sea, but officials said they did not view the display as a threat.