Washington and the international community won't recognize the outcome of Sunday's referendum in Crimea on seceding from Ukraine, U.S. Secretary of State John Kerry said Friday after six hours of talks with Russia's foreign minister.
His comments came after Russian Foreign Minister Sergey Lavrov acknowledged there was no "common vision" between the two nations over the crisis in Ukraine.
The vote in Crimea — Ukraine's strategic Black Sea peninsula of 2 million people — is widely expected to back secession and possibly lead to annexation with Russia at some point. The new government in Kiev believes the vote is illegal, but Moscow says it does not recognize the new government as legitimate.
The U.S. and the 28-nation European Union say the Crimean vote violates Ukraine's constitution and international law. If Crimea votes to secede, the U.S. and the EU plan to slap sanctions as early as Monday on Russian officials and businesses accused of escalating the crisis and undermining Ukraine's new government.
Kerry said Friday he had put forward several ideas on how to respect Ukraine's sovereignty and address Russian concerns in the talks in London, but that Lavrov made clear that Russian President Vladimir Putin would not take any decisions until after Sunday's vote.
Lavrov on Friday reaffirmed that Russia will "respect the results of the referendum" in Crimea and said sanctions would harm relations.
"Our partners also realize that sanctions are counterproductive," he said.
European and U.S. leaders have repeatedly urged Moscow to pull back its troops in Crimea and stop encouraging local militias there who are hyping the vote as a choice between re-establishing generations of ties with Russia or returning to echoes of fascism from Ukraine's World War II era, when some residents cooperated with Nazi occupiers.
The showdown between Russia and the West has been cast as a struggle for the future of Ukraine, a country with a size and population similar to France. Much of western Ukraine favors ties with the EU, while many in eastern Ukrainehave closer economic and traditional ties to Russia. Putin has worked for months to press Ukraine back into Russia's political and economic orbit.
While the Russian Foreign Ministry engaged in more sabre-rattling Friday by warning that it reserves the right to intervene in eastern Ukraine in defense of ethnic Russians who it claims are under threat, Lavrov denied any plans to send troops there.
"Russia doesn't and can't have any plans to invade southeastern regions of Ukraine," he said.
The Russian Foreign Ministry said clashes overnight Thursday in the eastern city of Donetsk showed that Ukrainian authorities had lost control of the country and could not provide basic security.
The clashes broke out, however, when a hostile pro-Russian crowd confronted pro-government supporters. At least one person died and 29 were injured.
Ukraine responded by calling the Russian statement "impressive in its cynicism."
"(The Donetsk clashes had) a direct connection to deliberate, destructive actions of certain citizens of Russia and some Russian social organizations, representatives of which are present in our country to destabilize the situation and escalate tensions," Ukrainian Foreign Ministry spokesman Evgeny Perebiynis said, according to the Interfax news agency.
The U.N. assistant secretary-general for human rights, Ivan Simonovic, told reporters Friday in Kiev that there was "no sign of human rights violations of such a proportion, of such widespread intensity that would require any military measures."
Russia has also sent thousands of troops to its long border with Ukraine, a move that U.S. officials have called an intimidation tactic cloaked as military exercises. The Russian drills announced Thursday included large artillery exercises involving 8,500 soldiers in the Rostov border region alone.
Western officials have asked Russia to start diplomatic talks with Kiev to de-escalate tensions but Russia says that government illegally drove Ukraine's pro-Russian president from power.
British Prime Minister David Cameron underlined the threat of sanctions.
"We want to see Ukrainians and the Russians talking to each other. And if they don't, then there are going to have to be consequences," Cameron told Kerry in a separate meeting Friday in London.
U.K. Foreign Secretary William Hague said while it was "not too late" for the Crimea referendum to be canceled, it was important to be "realistic" about the prospects.
"The fact that so far Russia has not taken any actual action to de-escalate the tensions makes this a formidably difficult task today," Hague said.
Kerry arrived in London with plans to make clear to Lavrov about the stakes that Russia faces. The U.S. wants Russia to accept something short of a full annexation of Crimea — but Kerry has not said what that might entail.
He told senators in Washington that should the Crimea vote take place and no resolution is reached, "there will be a very serious series of steps on Monday in Europe and here."
Obama has imposed limited sanctions against unidentified Russian officials thought by the U.S. to be directly involved in destabilizing Ukraine. But Congress on Thursday put off a vote until after March 24 that would have expanded those sanctions, as well as approve $1 billion in loan guarantees to Ukraine and International Monetary Fund revisions to help Kiev.
Pentagon sending ready-to-eat meals to Ukraine
Meanwhile, U.S. officials say the Pentagon is sending 25,000 cases of military prepackaged meals to Ukraine, in response to a wide-ranging request from that country for some rifles, ammunition, medicine and other supplies for its troops.
The officials say the meals ready to eat — known as MREs — have not yet been delivered but are in the pipeline.
The U.S. also is keeping the naval aircraft carrier USS George H.W. Bush in the Mediterranean Sea for several more days, as part of the U.S. effort to reassure allies in the region in the wake of Russia's military intervention into Ukraine's Crimea region.
The moves come as the U.S. continued to condemn Russia's action while also steering clear of any direct military assistance or involvement in the crisis.
Peter Leonard and Vladimir Isachenkov in Moscow, Maria Danilova in Kiev, and Lolita C. Baldor contributed to this report.