In the north a 50,000-strong Russian force is attacking Sumy, a provincial capital. Our model is detecting artillery fire and explosions along the city’s northern defensive lines. Ukraine is badly outnumbered but officials say the front is holding.

For months the talk in Kyiv was of a much-anticipated Russian offensive that would aim to gobble up more of Ukraine’s eastern regions. So far, it’s been underwhelming – but the Russians have made some gains and vastly reinforced their troop numbers in some areas.

Russia’s attacks on Ukraine are escalating, both on the front lines and across urban centres. Ben Hall, the FT’s Europe editor, talks to military analyst Franz-Stefan Gady about Ukraine’s battle to hold onto territory until a ceasefire can be agreed. Clips: Channel 4; ABC