After three more mystery objects were found flying over North America and shot down, the Defence Secretary has ordered a security review of British Airspace.

Have they already flown over us, and have we been looking for them? Sitrep asks a former RAF Operations Commander.

Hundreds of British troops are helping to defend Estonia, a country that has sent its entire Howitzer artillery stock to Ukraine. We hear from soldiers on exercise and Estonia’s Defence Minister.

Plus we explain whether Russia has begun its new offensive, and examine how long NATO nations can keep supplying vital military aid to Ukraine.