Switzerland will host from June 15-16 peace summit for Ukraine BERN: Ninety states and organizations 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.