Infighting that led to the firing of the defense minister - and to streets protests - and days later of top general Syrskyi, also cracked the all-important sense of wartime unity and overshadowed the narrative that Ukraine is riding high in the war

Ukrainian drone attacks targeted military and energy infrastructure and oil depots on the Baltic coast; the attack came on the opening day of St Petersburg Economic Forum, a three-day event that also welcomed US representatives after years

A chain of human errors led to violate safety procedures in an imperfect reactor and triggered the worst nuclear accident ever recorded, occurred at Chernobyl 40 years ago; Today the area, off-limits to humans, is forested and populated with wild species

As war enters its fifth year, Kyiv has been seeking new ways to avoid risking heavy losses of soldiers and the use of unmanned ground vehicles has increased; armed with bombs, guns or rockets they have forced Russian troops to surrender their position