More than six months after Russian President Vladimir Putin launched an invasion into neighboring Ukraine, the two countries are engaged in a struggle for control of areas throughout eastern and southern Ukraine.Ukrainian President Volodymyr Zelenskyy, whose forces began an offensive in August, has vowed to take back all Russian-occupied territory.-ABC News’ Luis MartinezUkraine to get 30 upgraded Soviet-era tanks from Czech Republic next yearSoviet-era tanks are getting new optics, armor, and more at a Czech facility in Šternberk, thanks partly to the efforts of Ukrainian refugees working there.Around 150 people have been hired by Excalibur Army in an effort to modernize old military equipment from around the world, which will then be shipped to Ukraine after months of work on upgrades.According to the company's commercial director, Richard Kuběna, it is concentrating on a large order to modernize up to 120 T-72 tanks, which the U.S. and the Netherlands governments ordered and paid 2.2 billion crowns for."