entering its fourth week say disaster for ukraine. this is the city of mario poll or what is lift-- mario pollndor what is left of it and volodymyr zelenskyy evoked the holocaust speaks to the particle. e he accused russia of wanting to inimpose a nazi style solution on ukraine, the united nations estimate more than 10 million people have been forced to flee their homes, that is over 20% of the country's population. in roam pope francis visited ukrainian refugees that the children's hospital. he said they are suffering quote. tonight russian forces are intensifying their attacks in the southeast as they continue to dig in elsewhere. cbs's imtiaz tyab begins our coverage in lviv. >> good evening. russia's ground offenses may have stalled but its air and sea assault on southern ukraine is only intensifying causing horrific damage.