Russia's brutal onslaught of Ukraine is raging on multiple fronts, but despite desperate pleas for more international assistance, the country faces Moscow's offensive largely alone. Key cities in Ukraine were attacked from several sides Tuesday, with Russia launching strikes on buildings in the center of the capital Kyiv, and scaling up its bombardment of Ukraine's second-largest city, Kharkiv. Russian military appears to have taken central Kherson after heavy shelling, with video and social media posts verified by CNN providing new evidence that the Russians are moving throughout the southern Ukrainian city apparently unimpeded. But while the US and NATO allies have aided Ukraine by sharing arms, military equipment and intelligence while imposing dramatic sanctions on Russia, the alliance has thus far made clear it has no plans to send soldiers into Ukraine -- a position US President Joe Biden reiterated in his State of the Union address on Tuesday.