Russia and the European Union failed to agree Friday on measures to prevent another cutoff of gas supplies to Europe, AP reported. EU leaders said their summit with Russian President Dmitry Medvedev improved a relationship severely strained by Russia's war with Georgia last summer and a winter gas cutoff of Russian supplies via Ukraine _ but there were no major breakthroughs. Tension over energy supplies and EU overtures to Russia's neighbors was palpable. Medvedev warned that the EU's strengthening ties with former Soviet states must not turn into an anti-Russian coalition. The talks «increased our mutual trust, which is very much needed and very important,» Czech President Vaclav Klaus, whose country holds the EU presidency, told a news conference after the summit in Khabarovsk, 3,800 miles (6,100 kilometers) east of Moscow.