Russia's new offensive into Ukraine's northeastern Kharkiv region has done what months of lobbying from President Volodymyr Zelensky could not: secured Kyiv's ability to fire advanced Western weapons at Moscow's forces within their borders. The Russian drive into the Kharkiv border region—where fighting is ongoing some 15 miles north of Kharkiv, Ukraine's second-largest city and an important political, economic, and cultural center—has prompted Kyiv's NATO backers into a flurry of diplomatic and military activity, with the result that Ukrainian cross-border strikes are now ravaging Russian forces operating in the Belgorod region.