Would mark

If confirmed by Pyongyang, the offer would mark the first time under the current leadership the North had declared itself willing to discuss conditions under which it might consider giving up its nuclear arsenal -- a move it has previously insisted was firmly off the negotiating table.

https://m.timesofindia.com/world/rest-of-world/north-korea-says-it-could-give-up-nuclear-weapons-in-exchange-for-security-guarantees/articleshow/63187858.cms

Please explain to me the use of "would vs will" in the above excerpts.