Question to the Ministry of Defence:

To ask His Majesty's Government what steps they are taking to (1) prevent, and (2) deter, further incursions by Russian spy ships.

Defence is ready to respond to any potential threats and take necessary steps to protect the UK's national interest. Defence will not shy away from robust action to protect Britain; with our NATO allies, we are strengthening our response to ensure that Russian ships and aircraft cannot operate in secrecy near UK or NATO territory.

The Royal Navy constantly monitors activity in and around UK waters and is ready and willing to respond if required, with ships held at high readiness under existing maritime security response plans. The Royal Navy is working closely across Government and with our international Allies to secure the waters and critical undersea infrastructure in and around the UK. HMG's centre of excellence for maritime security, the Joint Maritime Security Centre monitors our critical national infrastructure for potential threats. The Royal Navy also patrols UK waters with Maritime Patrol Aircraft and the Multi-Role Ocean Surveillance programme and continues to invest in new capabilities.

This includes responding to the Yantar, a Russian ship used for gathering intelligence and mapping to threaten our critical national underwater infrastructure and pose a threat to our way of life. During the Yantar's most recent deployment in and around the UK's exclusive economic zone, she was continuously and closely monitored by Royal Navy frigate HMS Somerset and the RAF's P-8s. Defence has also directed a change in the Royal Navy's posture, so that we can more closely track and robustly respond to the threats from this vessel and many others. Such actions have previously included surfacing a Royal Navy submarine - strictly as a deterrent measure - to make clear that we monitor every move.