European leaders are expected to discuss sanctions against Russia over Ukraine . David Clark says Putin acted without thought and Russia 's economy is weak . He says Russia has vulnerabilities it can leverage -- and should do so . Putin wants to rebuild his influence over Ukraine as a whole and recognizes that the occupation of Crimea is more likely to unite the country against him . He says that diplomacy will not be enough , otherwise the war will be wasted .
European leaders are expected to discuss sanctions against Russia over Ukraine . David Clark says Putin acted without thought and Russia 's economy is weak . He says Russia has vulnerabilities it can leverage -- and should do so . He says that diplomacy will not be enough , otherwise the war will be wasted .