L'AQUILA, Italy (Reuters) - Russian President Dmitry Medvedev warned the United States Friday that if it did not reach agreement with Russia on plans for missile defense systems, Moscow would deploy rockets in an enclave near Poland. In sharp contrast to his positive words during President Barack Obama's visit to Moscow earlier this week when the two reached broad agreement on nuclear arms cuts, Medvedev used a news conference at the G8 summit to return to Russia's earlier tough rhetoric on arms control. Referring to an order he gave earlier this year to prepare deployment of short-range Russian missiles in the western enclave of Kaliningrad to answer to any U.S. deployment of a missile shield in central Europe, Medvedev said: "If we don't manage to agree on the issues, you know the consequences. What I said during my state of the nation address has not been revoked." Medvedev also appeared to change his tone on the missile defense shield itself. During Obama's visit he told the U.S. leader, using markedly softer language than normal, that "no one is saying that missile defense is harmful in itself or that it poses a threat to someone." Medvedev threatens U.S. over missile shield | Politics | Reuters Senate Republicans see a new agreement forged between President Obama and Russian President Dmitry Medvedev as an opportunity to force Democrats hand on a major security issue: missile defense. Sixty-seven senators, or two-thirds of those present, must agree to ratify any deal seeking to reduce nuclear weapons between the two nations, giving Senate Republicans, who only control 40 seats, rare leverage. The high bar for ratifying treaties will put pressure on Obama to finish construction of a missile shield in Eastern Europe. At the very least, it will make it very difficult for the president to limit that shield in exchange for Russian concessions on the size of its nuclear stockpile. Republicans are already demanding that Obama press Russia into allowing a missile defense system in Eastern Europe in return for the U.S. agreeing to reduce its nuclear arsenal to between 1,500 and 1,675 warheads. I dont want the Russians to get something and we get nothing. I dont know what were getting out of this, said Sen. Lindsey Graham (R-S.C.), an influential member of the Armed Services Committee. I think the administration is going to make a mistake if they dont recognize the missile-defense components of this debate have to be addressed. TheHill.com - Nukes treaty gives GOP weapon on missile defense President Obama has made his first mistake in Russia even before he arrives in Moscow today. His attempt to cast Vladimir Putin as yesterdays man and to drive a wedge between the Prime Minister and President Medvedev demonstrates a misreading of relations in the Kremlin. Barack Obama makes basic error over balance of power in Kremlin - Times Online Its fairly clear that President Obama has little skill in foreign policy matters and this new treaty contains language that not only limits offense assets but DEFENSIVE assets. This from the same president that cut missile defense in the wake of rising threats the world over.