The S-400 is formidable air-defense system that has drawn comparisons to the US Patriot battery. Kyiv's military intelligence said in a statement that the attack dealt a "painful blow" to Russia.

Ukrainian forces fired a US-made HIMARS system at Russian military in Donetsk region. HIMARS are ground-launched rocket-propelled artillery that have been crucial to Ukraine's fight with Russia. The ...

The Air Force no longer plans on installing and operating a high-energy laser weapon on a special operations gunship due to "technical challenges," an official said, bringing the service's latest ...