Responding with strength and resolve when your country is under threat is an essential component of political leadership.

There is a Labour tradition that understands that, and it has been understood by Prime Ministers of all parties who have stood at that Dispatch Box. That means when chemical weapons are used, we need more than words, but deeds.

Yesterday, I asked the Prime Minister what more she can do to enhance our solidarity with our allies, particularly at a time when nationalist forces are trying to drive wedges between democratic countries, with some of those forces backed and supported by the Russians themselves.