It’s been almost a month since Russia launched its full-scale invasion of Ukraine. The UN Human Rights Office says at least 902 civilians have been killed between Feb. 24 and March 19, but warns that the real death toll is actually considerably higher as it has not yet verified numbers from several badly hit cities, including the besieged Mariupol.

Still, as the war rages on, the capital Kyiv and much of the rest of the country remains in Ukrainian control. Today, the Wall Street Journal’s European security correspondent James Marson explains the state of Russia’s war in Ukraine now, where Russian forces have advanced, and the strength of the Ukrainian resistance.