How can NATO best protect its Eastern flank?

Some Eastern European countries have called on NATO to strengthen its eastern borders following recent events in Russia. This week Germany said it plans to keep 4000 troops permanently in Lithuania, once the infrastructure is in place.Germany already leads a multi-national battlegroup in Lithuania, as the UK does in Estonia, as part of NATO’s Enhanced Forward Presence. What could Germany’s move mean for the rest of NATO? Sitrep talks to the former Chief of the Defence Staff, General Lord Richards, about the planned deployment and about the strength of Russian forces in Ukraine. And finally, Sitrep hears from a Hercules pilot as the aircraft makes its last RAF flight…