World leaders at the Ukraine summit for peace in Switzerland are exploring ways of ensuring the security of nuclear sites and of Ukraine's food exports. They are seeking to adopt a final communique which blames the war's widespread suffering and destruction firmly on Russia, which Kyiv would regard as a success. But Austria's leader has said that the declaration is not expected to gain unanimous support from participants. More than 90 countries and international organisations are attending the summit, aimed at creating the broadest possible backing for a process that could help end the war in Ukraine. Russia has not been invited, and its biggest backer China is not present, leading some to cast doubt on the summit's effectiveness. The draft final document, seen by Reuters news agency, calls for Ukrainian control to be restored over the Zaporizhzhia nuclear power plant and the country's ports on the Azov Sea, all currently occupied by Russia.