Russia warns that the use of US long-range missiles by Ukraine will provoke a significant response, marking a shift in US policy approved by President Biden. The decision allows Ukraine to target Russia with ATACMS missiles, amidst escalating tensions and North Korean troop support for Russia. Ukraine's President Zelensky suggests the missiles will demonstrate their impact without formal announcements. The situation remains tense with ongoing Russian attacks on Ukrainian infrastructure. Full article (bbc.com europe)