Kyiv held “substantive” talks on security and economic issues with Donald Trump’s son-in-law Jared Kushner and envoy Steve Witkoff, with more discussions expected in Davos this week, Ukraine’s security chief said Sunday.Ukrainian President Volodymyr Zelenskyy, who has said he hopes to sign documents with the US on security guarantees at Davos, said his team had held several rounds of talks in the US.For the latest updates on the Russia-Ukraine war, visit our dedicated page.“We had substantive discussions on economic development and prosperity plan as well as security guarantees for Ukraine,” security chief Rustem Umerov said on social media.More talks will be held at this week’s Davos Economic Forum, he added.The talks came as the fourth anniversary of Moscow’s invasion looms and as Russia has pounded Ukraine’s energy facilities during a freezing winter - with parts of Kyiv still without heating in temperatures as low as -12C.The Ukrainian team held talks with Kushner, Witkoff and US