this is bbc news. these are the latest headlines in the uk and around the world. in a phone call with ukraine's leader, president biden says he'll respond "swiftly and decisively" if russia invades the country. more than a dozen countries tell their citizens to leave ukraine, whilst over 100,000 russian troops remain at the border. 13 people are injured after a mezzanine floor collapses at a pub in east london. police have cleared the remaining protesters blocking a key bridge between canada and the united states, after a week of disruption. and people in switzerland have voted in favour of tightening the country's tobacco laws by banning virtually all advertising of tobacco products.