<p>President Volodymyr Zelenskyy said on Monday that Ukraine has hit more than 30 Russian oil refineries, terminals and oil depots.</p>.Russia is revising its nuclear doctrine, Kremlin says.<p>He did not provide any additional details or give a time period. Ukraine has stepped up attacks on Russian oil facilities this year, seeking to disrupt oil supplies to the Russian army and curb Russia's revenues to finance its war against Ukraine.</p>
<p>President Volodymyr Zelenskyy said on Monday that Ukraine has hit more than 30 Russian oil refineries, terminals and oil depots.</p>.Russia is revising its nuclear doctrine, Kremlin says.<p>He did not provide any additional details or give a time period. Ukraine has stepped up attacks on Russian oil facilities this year, seeking to disrupt oil supplies to the Russian army and curb Russia's revenues to finance its war against Ukraine.</p>