We have significant concerns about the recent Russian military build-up of forces on Ukraine's border. We are working with our allies—I was at a NATO meeting of Foreign and Defence Ministers last week—and our objective is to deter Russia, reassure Ukraine and de-escalate the situation.

I thank the hon. Gentleman, who has long-standing experience of this issue; I agree with his level of concern. There are three things that we are doing right now that matter. The first is holding Russia to its international commitments, including not just the ones that he mentioned, but the OSCE principles of accountability for the build-up of troops. We will continue our robust approach to sanctions and provide diplomatic support; since 2015, through Operation Orbital, we have trained more than 20,000 Ukrainian armed forces personnel.

I thank the Chair of the Select Committee, but I am afraid that he is wrong. It is vital that we increase the defence and security budget in a groundbreaking way; it must be agile and fit for future challenges. In Brussels on 14 April, I spoke to US Defence Secretary and Secretary of State along with other NATO Ministers about condemning Russia's troop build-up, assuring Ukraine, and de-escalating the situation.

I thank the hon. Lady, but I have to say that her attempt is a weak weave of partisan political considerations in a serious international issue. We have taken multiple actions against Russian threats; introduced new powers at UK ports for security checks; are introducing legislation for additional tools to tackle hostile state activity; and will introduce an extension of Magnitsky sanctions soon.

In relation to agent registration, the Home Secretary has already announced and proposed it. She is talking over me because she does not like my response; I galvanised international reaction against Putin when this Prime Minister was Foreign Secretary.