Italy – 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 What I said during my state of the nation address has not been revoked.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.

But at the Group of Eight rich nations summit in Italy on Friday, Medvedev returned to a traditional posture on the system, describing it as harmful and threatening to Russia.

In Moscow, Medvedev and Obama agreed a target for cuts in nuclear arms and a year-end deadline for a reduction deal. Obama praised Medvedev as a straightforward professional leader.

Before his Moscow visit, Obama made clear he would not accept any effort by Moscow to link arms control to missile defense, and reiterated Washington's stance that any system would be to protect against a threat from Iran, not from Russia.

He has been less enthusiastic about the plan, which will put a radar installation in the Czech Republic and 10 interceptor missiles in Poland, than predecessor George W. Bush, but seems unlikely to abandon it without getting something in return.

The Czech Republic and Poland have signed treaties with Washington on the plan, with both governments making the project a priority to counter what they see as Russia's continued influence in the region.

(Writing by Michael Stott; editing by Ralph Boulton and Elizabeth Piper)

Poland Russia Dmitry Medvedev Barack obama