Russian President Dmitry Medvedev began a summit with EU leaders Friday expected to relaunch talks on a partnership pact after a thaw in relations, according to DPA. Analysts say the negotiations will offer both sides a chance to size up the political will to overcome a host of problems in the energy and security sectors before a deal can be brokered. Official talks on the broad-ranging political pact will begin on July 4 in Brussels. Brussels-based diplomats hope Medvedev will prove a more flexible partner than his predecessor Vladimir Putin, whose bellicose line aggravated relations with the EU's post-Soviet member states, according to DPA. Poland and Lithuania vetoed earlier attempts at an agreement because of bilateral trade rows and Russia's entanglement in the so- called frozen conflicts in Georgia and Moldova. Medvedev has shown no inclination to exacerbate things, but press statements by his top advisors have criticized attempts by EU member states to "politicize" relations and manipulate the EU. Both sides differ on what form a new agreement should take. Russia wants a more general plan mapped on the one which expired last year, while the EU insists on a more detailed pact, with precise wording on energy and security issues.