The vessel was probably part of a river fleet serving Viminacium, the sprawling and highly-developed Roman city of 45,000 people.
The relic was located and filmed using a remotely operated robot.
"All ships proceeding to Ukrainian ports in Black Sea waters will be considered as potential carriers of military cargo," the Russian Defense Ministry stated.
The US will send fighter jets and a warship to the Middle East in order to monitor key waterways in the region.
Russia's new Karakurt-class missile corvette ship the Tsiklon is reportedly armed with Zircon hypersonic missiles, in addition to its arsenal of cruise missiles.
Large ships constructed by Roman Emperor Caligula were extracted from the lake in the 1930s but were destroyed during World War II.
The family of Hamish Harding, one of the passengers who perished on the Titan submersible, criticized his alma mater for throwing an underwater themed ball with submarine decorations.
Debris from the Titan submersible indicates that a catastrophic implosion destroyed the sub and instantly killed the five passengers onboard.
467336 (2002 LT38) is, if rounding up a bit, twice the size of the infamous sunken passenger liner, the Titanic, according to NASA. But we're in no danger of it hitting the Earth.
A five-person submersible vessel taking tourists on a $250,000 trip to see the wreckage of the 1912 Titanic disaster 12,500 feet (3,800m) undersea is missing in the Atlantic off Canada.
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