Russia launched waves of drones and ballistic missiles at multiple targets across a broad swath of Ukraine early Friday, killing at least four people in the capital and wounding around 40 across the country.

Technological advances have given threadbare militaries and rebel fighters the ability to strike stunning blows against far stronger forces.

The covert operation was described as one for the “history books” by Ukraine’s president. According to Ukrainian officials, nearly a third of Moscow’s strategic bomber fleet was destroyed or damaged with cheaply made drones sneaked into Russian territory in the span of a few hours on Sunday.

The Ukrainian military says its new weapon system, which launches antiaircraft missiles from a remote-controlled speedboat, has brought down two Russian jet fighters.

President Volodymyr Zelensky confirmed that U.S. President Donald Trump's administration diverted 20,000 anti-drone missiles originally intended for Ukraine to American forces in the Middle East, in an interview with ABC News published on June 8.

Former Rep. Chris Stewart, a former fighter pilot, says the U.S. isn’t prepared for this change in modern warfare.