Ninety states and organisations have so far registered to take part in a summit aiming to pave the way for peace in Ukraine that Switzerland will host from June 15-16, the Swiss government said on Monday.

Russia has not been invited to the summit, but the government said in a statement that the gathering will aim to "jointly define a roadmap" on how to involve both it and Ukraine in a future peace process. (Reporting by Dave Graham, Editing by Rachel More)