Some analysts say a declaration by either President Medvedev or Prime Minister Putin could upend Russian politics well ahead of next year's presidential vote.
Russia's Dmitry Medvedev and Poland's Bronislaw Komorowski met on the one-year anniversary of a plane crash that killed Poland's former president en route to Russia. A probe of the crash has sparked controversy.
A US Russia nuclear deal on reducing their arsenals has received global praise. But some in Russia worry that President Medvedev may have allowed too much leeway for the US to develop missile defense systems.
Could this be the end of the brief thaw between Russia and NATO?