Defense Secretary Ash Carter and his British counterpart Michael Fallon on Wednesday signed a “first-of-its-kind agreement” to jointly advance offensive and defensive cyber capabilities, Carter said in a joint press conference in London as part of his three-day trip to the United Kingdom and Norway.

The cyber memorandum of understanding will enable the two nations to share more information and perform vital research and development together to advance their offensive and defensive cyber capabilities as they partner in new ways and in new domains to strengthen their longstanding alliance, according to a Department of Defense report.

“This agreement sends a clear message to our adversaries that the two nations who partnered together at Bletchley Park decades ago to crack German codes are going to be doing more together in yet another arena— namely cyberspace,” said Carter.