The Ukraine Family Scheme enables you to come to the UK or to stay longer depends upon certain criterias. It is free to apply. You’ll be able to live, work, study and claim benefits in the UK. For more details, click on https://www.gov.uk/guidance/support-for-family-members-of-british-nationals-in-ukraine-and-ukrainian-nationals-in-ukraine-and-the-uk
Ukrainian nationals – get UK visa support