Ukraine

Updated at 3:16 p.m. ET

Former Trump campaign chairman Paul Manafort received a total sentence of about 7 1/2 years in federal prison on Wednesday following the guilty plea in his Washington, D.C., conspiracy case.

Judge Amy Berman Jackson effectively added about 3 1/2 years in prison to the sentence Manafort received last week from a different judge in the Eastern District of Virginia.

Ukraine's President Petro Poroshenko on Friday barred Russian men of military age from entering the country, saying the order was needed to prevent an infiltration in what appeared to be an allusion to Moscow's 2014 takeover of Crimea from Ukraine.

Poroshenko's decree comes days after he assumed martial law powers in Ukraine following a maritime skirmish in the Kerch Strait that joins the Black Sea and the Sea of Azov through Crimea. That encounter saw Russian warships fire on and seize three Ukrainian navy vessels, wounding several of their crew.

Editor's note: On Thursday, President Trump said on Twitter he had canceled a planned meeting with Russian President Vladimir Putin, citing intensifying Russian aggression toward Ukraine.

Russia is sending new S-400 surface-to-air missile batteries to its installations in Crimea, its defense ministry says. The move comes days after Russian warships seized several Ukrainian naval vessels, adding to tensions with neighboring Ukraine over the land Russia seized in 2014.

Ukraine's parliament has agreed to impose martial law in 10 of its provinces to combat "growing aggression from Russia," after a weekend confrontation in waters off the disputed Crimean Peninsula led Russia to seize three Ukrainian navy vessels.

Updated at 3:40 p.m. ET

Russia's seizure of three Ukrainian naval vessels near Crimea is an "outrageous violation of sovereign Ukrainian territory," says U.S. Ambassador to the U.N. Nikki Haley, calling it "another reckless Russian escalation" in a deadly and years-long conflict.

Updated at 3:36 p.m. E.D.T. on December 4.

President Trump may have been involved with a change to the Republican Party campaign platform last year that watered down support for U.S. assistance to Ukraine, according to new information from someone who was involved.

Diana Denman, a Republican delegate who supported arming U.S. allies in Ukraine, has told people that Trump aide J.D. Gordon said at the Republican Convention in 2016 that Trump directed him to support weakening that position in the official platform.

Updated at 5:57 p.m. ET

Ransomware hit at least six countries Tuesday, including Ukraine, where it was blamed for a large and coordinated attack on key parts of the nation's infrastructure, from government agencies and electric grids to stores and banks.

The malware has been called "Petya" — but there is debate in the security community over whether the ransomware is new or a variant that has been enhanced to make it harder to stop.

A former Russian parliamentarian named Denis Voronenkov, who fled Russia last October and has criticized President Vladimir Putin's government, was killed in Kiev on Thursday, in an apparent assassination that Ukrainian President Petro Poroshenko is reportedly calling "state terrorism."

The chairman of Donald Trump's presidential campaign says he never received a single off-the-books cash payment for political work in Ukraine.

The statement from campaign chairman Paul Manafort comes after The New York Times reported that his name appears in a so-called "black ledger" recording under-the-table payments made by the political party of Ukraine's former pro-Russian president, Viktor Yanukovych.

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