NATO fighter jets shot down a drone that entered Lithuanian airspace and Denmark accused a Russian frigate of firing flares at a Danish military helicopter on Tuesday, in incidents that heightened tensions along the alliance’s eastern flank. EU chief warns of wider conflict as border incursions stoke fears that Ukraine war is spilling into neighbouring states. Key points and original sources are listed below.

• NATO fighter jets shot down a drone that entered Lithuanian airspace and Denmark accused a Russian frigate of firing flares at a Danish military helicopter on Tuesday, in incidents that heightened tensions along the alliance’s eastern flank.S1

• EU chief warns of wider conflict as border incursions stoke fears that Ukraine war is spilling into neighbouring states.S2

• Denmark and Russia blamed each other for the flares fired at a Danish military helicopter monitoring a Russian frigate on Monday.S3