Violent extremists, foreign fighters, and criminals are part of the daily refugee flow into Europe, the top Nato military commander in Europe told lawmakers, “masking the movement” of these dangerous elements and heightening potential for an attack.

An attack on a passenger bus in eastern Ukraine has killed 11 people, likely dealing the final blow to hopes that a short-lived and shaky ceasefire could take hold.

New columns of Russian troops and tanks have rolled into eastern Ukraine, Nato’s top commander has said. The claim was promptly denied by Moscow.