Negev summit to focus on regional threats, challenges, and opportunities. Vienna negotiation on nuclear deal with Iran, Russia-Ukraine war, also expected to dominate the top diplomats' meetings.

"Now we are very close to an agreement, and I hope it will be possible," Brussels' top diplomat says. Iranian FM insists lifting US sanctions on the Revolutionary Guards is a top demand, but hints it will not decide the fate of the negotiations.

In Poland, the US president warns the Russian leader against invading even "an inch" of territory of a NATO nation and urges Western allies to brace for what will be a turbulent road ahead in a "new battle for freedom." Russian forces said to target Kharkiv nuclear facility. Holocaust memorial reportedly damaged by Russian forces outside Kharkiv.

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