Treasury hits six executives and board members of manufacturer for aircraft that Russian forces have been using to attack Ukraine

Morale significantly hindered by death of over 60 soldiers and failure to make advances in invasion of Ukraine, with Zelensky and analysts expecting Putin to escalate measures

Experts warn it's likely only a matter of time before both sides take relatively small step of deploying even smarter lethal weapons, setting stage for profound change in warfare

Kyiv mayor says unmanned aerial vehicles were headed for capital; 3 civilians killed; 'critical infrastructure project' and residential buildings damaged

Authorities identify Tehran-supplied UAVs; Kyiv police chief publishes photo of wreckage of one craft with 'Happy New Year' scrawled on it; no comment on how many hit their targets

Report says Biden administration working closely with Israel on matter, but blocking regime from acquiring parts proving tricky

Mykhailo Fedorov says Ukraine has fleet of 1,400 reconnaissance drones and is developing strike drones; Moscow claims Kyiv utilized attack drones in recent hits on airbases

Russia says three servicemen were killed by debris at the Engels airbase, which houses Tu-160 nuclear-capable strategic bombers

Russian media says 'technical servicemen' dead after UAV shot down at low altitude, in second attack on Engels base within weeks

Presidential adviser says Tehran gearing up to boost supplies to Moscow, ignoring international sanctions; Mossad chief also warns of increase in arms deliveries to Kremlin