Missile-toting drone boats blew up two Russian helicopters and damaged a third in a Black Sea skirmish. Why it matters: Ukrainian outlets said the shoot-downs were world firsts. Engagements like this — especially with video evidence — leave little room for drone warfare naysayers.

As a result of the attack on Jan. 6, two Russian anti-missile Pantsir-S1 systems and one OSA anti-aircraft vehicle were reportedly damaged or destroyed in the occupied part of Ukraine's southern Kherson Oblast.

The Russian Black Sea Fleet was defeated in an encounter with a country practically devoid of warships. The key turned out to be essentially armed, remote-controlled Ukrainian watercraft, which continue to evolve.