Cabinet appoints Yvhen Khmara as acting defense minister after day of uncertainty * Ukraine strikes oil refinery in Russia's Yaroslavl Oblast, vessels in Black, Azov

Ukraine and Russia tweak and upgrade their drones every few weeks in a bid to overtake the other in the unmanned systems race.

A new generation has been cutting red tape to speed weapons to the front. But the old guard pushed back, and now Ukraine’s young defense minister is out.

The European Union’s top official signed an agreement to move forward on joint weapons production with Ukraine on Wednesday, saying Kyiv’s fight against Russia’s 4-year-old invasion is a key part of the continent’s defense.

Following Russia’s invasion of Ukraine, hundreds of companies pledged to leave. Four years later, some are still engaged, indirectly helping bankroll the war in Ukraine.

Retired Gen. Philip Breedlove says Ukrainian strikes on energy infrastructure force Putin to divert military assets as fuel shortages spread nationwide.

Russia’s decision to launch a full-scale invasion of Ukraine has now cost the country some 450,000 lives, according to a new study that estimates the war’s total casualty numbers to have surpassed 2 million.

Strict new rules have disrupted casual users and increased compliance hurdles for industrial applications like power grid inspections For years, aerial drones frequently buzzed above the Huangpu River in Shanghai,

By Max Hunder and Tom Balmforth KYIV/LONDON, July 16 (Reuters) - An extraordinary outburst by outgoing Defence Minister Mykhailo Fedorov laid bare a rift at the heart of Ukraine's war effort on Thursday,