Impose sanctions on refineries that buy Russian crude oil to end war, says Bill Browder

Putin critic says plants in China, India and Turkey are funnelling up to $1bn a day to Kremlin

Russian drone attack on bus carrying mine workers in Ukraine kills at least 12

Employees of Ukraine’s largest private energy firm, DTEK, were travelling about 40 miles from frontline, says police

International law meant to limit effects of war at breaking point, study finds

Report covering 23 conflicts over last 18 months concludes more than 100,000 civilians have been killed as war crimes rage out of control

Thousands without heating on icy night in Ukraine as Russia attacks before talks

Zelenskyy says Putin ‘taking advantage of the coldest days of winter to terrorise people’, as Kyiv hits lows of -20C

Ukraine and Russia begin second round of US-led peace talks in Abu Dhabi

Major obstacles to viable deal remain after Volodymyr Zelenskyy accuses Moscow of violating energy truce

EU deal on Ukraine loan could boost UK if it agrees to help pay costs

British firms could get more opportunities to supply defence equipment to Kyiv if agreement can be reached

Sanctions having ‘significant impact’ on Russian economy, says EU special envoy

Exclusive: David O’Sullivan says war-based economy may be nearing point of becoming ‘unsustainable’

Second day of Ukraine-Russia peace talks in UAE end without breakthrough

Meetings are most significant contact between Kyiv and Moscow in months and prisoner exchange is agreed

UK threatens to seize Russia-linked shadow fleet tanker in escalatory move

Capture of rogue ship could open a new front against Moscow at a time when Russia’s oil revenues are tumbling

Zelenskyy says US has set June deadline for Ukraine-Russia peace deal

Ukrainian president says Trump administration has proposed to host next round of trilateral talks in US

Europe’s ‘painful’ realisation it must be bolder with US set out in security report

Need for greater military autonomy also accepted, says report for Munich Security Conference, which takes place this week

Experts sound alarm over UK exports to firm linked to Russian war machine

Exclusive: Multimillion-pound contract raises concerns about controls designed to prevent firms unwittingly aiding destruction of Ukraine

Russia scrambles to close communications gap on battlefield after Starlink deactivated

Elon Musk’s SpaceX blocks Russia’s illicit use of satellite internet, which Ukraine says is already affecting operations

Russian crackdown on Telegram app prompts rare criticism from soldiers, pro-war bloggers and officials

Critics say restricting social media app risks harming communications between state, military units and public

‘Everything is frozen’: bitter winter drags on for Kyiv residents as Russia wipes out power

Kremlin’s repeated targeting of infrastructure has left thousands without heating, reliant on shelters and desperate home hacks