Tributes have been paid to a 14-year-old Ukrainian boy who died warning elderly neighbours of an imminent Russian air strike.
Viacheslav Yalyshev was alerted to the impending attack on the port city of Odesa through an app on his phone.
His first instinct was not to save himself but to run around his neighbourhood, which is home to many older people who do not own smartphones, ensuring those who needed help could get to safety.
