No, there is no credible information or evidence to suggest that Ukraine has attacked the Kremlin in Russia with drone strikes. It’s important to be cautious about unverified claims or rumors, especially when they involve significant events or international conflicts. As of my knowledge cutoff in September 2021, there have been no reports or reputable sources confirming such an attack. It’s always advisable to rely on verified news sources and official statements for accurate information regarding geopolitical events.