<p>Ukraine did not notify the United States in advance of drone attacks carried out on Russian air bases, a Ukrainian government official told Reuters on Sunday.</p> .Ukraine to set out roadmap for peace at Istanbul talks, document shows.<p>Ukraine's domestic intelligence agency, the SBU, said it was responsible for the attacks on four bases and a security official said a total of 41 Russian warplanes were hit. </p>.<p>Russia's Defence Ministry said aircraft had caught fire at bases in two regions, but the blazes had been extinguished.</p>
<p>Ukraine did not notify the United States in advance of drone attacks carried out on Russian air bases, a Ukrainian government official told Reuters on Sunday.</p> .Ukraine to set out roadmap for peace at Istanbul talks, document shows.<p>Ukraine's domestic intelligence agency, the SBU, said it was responsible for the attacks on four bases and a security official said a total of 41 Russian warplanes were hit. </p>.<p>Russia's Defence Ministry said aircraft had caught fire at bases in two regions, but the blazes had been extinguished.</p>