The front lines in Russia’s war in Ukraine have barely moved in three years. The battle in the air has evolved constantly, with each side adjusting its tactics in response to technological breakthroughs and capability improvements.

The United Kingdom will join the Prioritised Ukraine Requirements List (PURL), an initiative under which NATO allies fund the purchase of US-made weapons for Ukraine.

LONDON, Feb 11 - Defence minister John Healey said on Wednesday Britain had committed 150 million pounds ($205 million) to the so-called Prioritised Ukraine Requirements List (PURL) initiative to supply Ukraine with U.

Moscow has been waging an intense campaign against Ukrainian energy targets.

Ukraine hit a factory that produces some of Moscow’s most sophisticated ballistic missile systems more than 1,400km behind Russian lines.

Patriot interceptors, made by the American company Lockheed Martin, are Ukraine's top defense against Russian ballistic missile attacks.

Secretary of State Marco Rubio offered some reassurance to uneasy European leaders at the Munich Security Conference, but did not back off underlying US demands. Follow live updates.