German authorities have warned repeatedly that Russia is conducting a hybrid campaign of drone and cyber attacks, and have blamed it for an attempted drone attack on Leipzig airport in August. Germany risks entering a "violent conflict" with Russia because of Moscow's increasingly aggressive stance against European nations, an intelligence chief has warned. Key points and original sources are listed below.

• German authorities have warned repeatedly that Russia is conducting a hybrid campaign of drone and cyber attacks, and have blamed it for an attempted drone attack on Leipzig airport in August.S1

• Germany risks entering a "violent conflict" with Russia because of Moscow's increasingly aggressive stance against European nations, an intelligence chief has warned.S2