Russia’s attack on Ukraine has intensified. Azovstal, Ukraine-based Metallurgy Plant, one of Europe's largest, has been attacked. It has been badly damaged as Russian armed forces lay siege to Mariupol, AFP reported. Mariupol is an important Ukrainian port city. Lesia Vasylenko, Ukrainian lawmaker, took to Twitter to post a video which showed thick volumes of smoke rising from the buildings due to the explosions. On February 24, Russian President Vladimir Putin launched a military operation in Ukraine. Watch the video to know more.