VERACRUZ, Mexico (AP) --
NEW: Ukraine to launch anti-terror operation
SLOVYANSK, Ukraine (AP) -- Ukraine's president Oleksandr Turchynov says the country is to launch a "large-scale anti-terrorist operation" to resist Russia's aggression.
Turchynov said in a live televised address from the parliament that authorities in Kiev will not allow the "repetition of the Crimean scenario."
Russia annexed the Crimean peninsula last month after local residents voted overwhelming to secede from Ukraine and seek to join Russia in a hastily called referendum.
Ukraine officer killed in gunbattle in east
SLOVYANSK, Ukraine (AP) -- It's the first report of a gunbattle in eastern Ukraine, where pro-Russian gunmen have seized a number of government buildings in recent days.
Officials say Ukrainian special forces exchanged gunfire with a pro-Russia militia today in the eastern city of Slovyansk, with at least one security officer killed and five others wounded.
An Associated Press reporter found an SUV with bullet holes on the side of the road, and a pool of blood on the passenger seat where the gunbattle was supposed to have taken place.
A lawmaker from the area who witnessed the attack says a car with four gunmen pulled up on the road in a wooded area and opened fire on Ukrainian soldiers who were standing beside their vehicles.
Unrest has spread to several cities in eastern Ukraine, including the major industrial city of Donetsk, which has a large Russian-speaking population.
Two rival rallies in another regional capital in eastern Ukraine, Kharkiv, turned violent. According to a Ukrainian news agency, a group of pro-Russian protesters followed several pro-Ukrainian activists, beating them with bats and sticks.
UN ambassador sees Russian involvement
UNDATED (AP) -- The U.S. ambassador to the United Nations says the latest violence in Ukraine carries "the tell-tale signs of Moscow's involvement."
Samantha Power tells ABC's "This Week" that the violence is "professional" and "coordinated" -- and doesn't seem to be "grassroots."
She says the United States could impose tougher penalties against Moscow if Russia continues its aggression.
NEW: Anti-Kremlin protest draws thousands in Moscow
MOSCOW (AP) -- More than 10,000 people have turned out in Moscow for an anti-Kremlin rally to denounce Russian state television's news coverage, particularly of the crisis in neighboring Ukraine.
In promoting the Kremlin line, state television has portrayed the new pro-Western government in Ukraine as a "fascist junta" under the control of the U.S. government and determined to oppress Russian speakers in eastern Ukraine. The broadcasts have taken on a harsh anti-American tone.
Some of the participants in Sunday's demonstration, called a "March of Truth," carried blue and yellow Ukrainian flags. One woman, wearing a traditional Ukrainian wreath of flowers on her head, held up a sign with President Vladimir Putin's picture and the words: "Stop lying."
The U.S. and Ukrainian governments have accused Russia of orchestrating the unrest in eastern Ukraine.
US ambassador: Talks with Iran continuing
WASHINGTON (AP) -- The United States' ambassador to the United Nations says talks about Iran's nuclear program are continuing undisturbed by Washington's decision to block Tehran's ambassador to the diplomatic body.
U.S. Ambassador Samantha Power on Sunday told ABC's "This Week" that Iran's selection of Hamid Aboutalebi (ah-boo-TAH'-leh-bee) to be its United Nations envoy is not acceptable. She says Tehran should pick someone else.
Iran has rejected that suggestion following Washington's refusal to give Aboutalebi a visa to enter the United States.
Aboutalebi was a member of the group responsible for the 1979 takeover of the U.S. embassy in Tehran that held 52 Americans hostage for 444 days. Aboutalebi has insisted his involvement in the Muslim Students Following the Imam's Line was limited to translation and negotiation.
Jury to be picked in NY trial of Egyptian preacher
NEW YORK (AP) -- Jury selection is set to begin in the New York trial of an Egyptian Islamic preacher extradited from Great Britain on charges he conspired to support al-Qaida.
Mustafa Kamel Mustafa (muh-STAH'-fuh kah-MEHL' muh-STAH'-fuh) has alerted his lawyers and the judge that he intends to testify. He faces charges he conspired to support al-Qaida by trying in 1999 to set up a terrorist training camp in Oregon and by helping abduct two American tourists and 14 others in Yemen in 1998. Four hostages died.
He has pleaded not guilty. His attorney, Jeremy Schneider, says the government is trying to taint the jury by talking about the Sept. 11 attacks and Osama bin Laden. Mustafa was brought to the United States for trial in fall 2012.