EU states added 15 more Russians and Ukrainians to their blacklist and will reveal them on Tuesday.
The new round of U.S. sanctions, following those imposed last month when Russia annexed Crimea, barely registered in eastern Ukraine, where pro-Moscow rebels were holding a group of German and other OSCE military observers for a fourth day.
Despite a Ukrainian military operation to contain them, the militants extended their grip by seizing key public buildings in another town in the Donetsk region. In the regional capital, Donetsk, club-wielding pro-Russian activists broke up a rally by supporters of the Western-backed government in Kiev.
The high-profile mayor of Kharkiv, Ukraine's second city, was badly wounded by a gunman, raising fears of further unrest in a Russian-speaking region that has seen less trouble of late than the neighboring provinces of Donetsk and Luhansk.
U.S. sanctions were aimed, Washington officials said, at "cronies" of Putin. Seven men, including Sechin, were targeted by visa bans and freezing of any U.S. assets, and 17 companies were also named. More pics after cut

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