I reassure my hon. Friend that we engage routinely with the US on a wide range of foreign policy and security issues, and similarly, this week US officials in Moscow will be talking about a range of issues. There is a timeframe, as my hon. Friend rightly points out. We very much want to adhere to the treaty while it is in place, and in our view it is Russia’s responsibility to come to the table and ensure the proper implementation of its obligations.