- Ukrainian President Zelenskyy issuing a grim warning ahead of that long-awaited counteroffensive against Russian forces. Zelenskyy signaling that his troops are ready, but telling "The Wall Street Journal" that, quote, a large number of soldiers will die. NBC's Tom Soufi Burridge on the ground in Ukraine. TOM SOUFI BURRIDGE: A dramatic search for survivors ongoing tonight. A Russian missile hitting this residential building in Dnipro. 20 wounded, say officials, including children. President Zelenskyy releasing the video, calling it a terrorist attack. It comes with Ukraine escalating strikes over its border into Russia. Officials in the Russian region of Belgorod saying two more civilians killed by Ukrainian shelling. Ukraine also ramping up long-range missile strikes on Russian-occupied southern Ukraine ahead of its counter-offensive. Explosions and smoke rising in video circulating online. VOLODYMYR ZELENSKYY: [NON-ENGLISH SPEECH] TOM SOUFI BURRIDGE: President Zelenskyy telling "The Wall Street Journal" his forces are now ready for that offensive, but warning it could come at a heavy cost. Even in this village cemetery, there are the graves of six recently killed Ukrainian soldiers. President Zelenskyy warning that many more Ukrainian soldiers will be killed in the counter-offensive if Ukraine cannot challenge Russia's dominance in the skies. But the White House this week addressing the concern that advancing Ukrainian ground forces could be vulnerable to Russian warplanes, saying Ukraine has the necessary air defense capabilities to go on the attack. And officials say three children are in a serious condition in hospital after that Russian missile strike in Dnipro, and a baby could be under the rubble. Whit. - That's just awful news there. Tom Soufi Burridge, thank you.