The situation on the front line in Ukraine is “very challenging,” President Volodymyr Zelensky said in his nightly video address on Monday. Ukraine’s forces must to do everything they can in the coming months, Zelensky said. “The most important thing is to put pressure on Russia using all available means and tools to achieve our goal of a real and just peace for Ukraine and all our people as soon as possible,” he said. “Everything that can be done this fall, everything we can achieve, we must achieve. And it depends on everyone in the Ukrainian team.” Zelensky said Ukraine was busy preparing f…