U.S. Secretary of State Rex Tillerson, left, speaks with his Russian counterpart Sergey Lavrov at the OSCE Foreign Ministers meeting in Vienna, Austria, Thursday, Dec. 7, 2017.(AP Photo/Ronald Zak)

U.S. Secretary of State Rex Tillerson, left, speaks with his Russian counterpart Sergey Lavrov at the OSCE Foreign Ministers meeting in Vienna, Austria, Thursday, Dec. 7, 2017.(AP Photo/Ronald Zak)

VIENNA (AP) — U.S. Secretary of State Rex Tillerson said Thursday that Ukraine was the sole sticking point keeping the United States and Russia from forging a closer relationship, suggesting that all other disputes were secondary.

“The issue that stands in the way is Ukraine,” Tillerson said.

The assessment from America’s top diplomat notably played down other areas of dispute, particularly Russia’s meddling in the 2016 presidential election. U.S. intelligence agencies, including the CIA and FBI, have concluded the Kremlin interfered in the election in an effort to help now-President Donald Trump and hurt Democrat Hillary Clinton.

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Trump has repeatedly cast doubt on that finding, and a special counsel is investigating whether members of the Trump campaign colluded with the Russian effort. He has said he believes Russian President Vladimir Putin’s personal denials that Moscow meddled.

But Tillerson hasn’t shied away from accusing the Kremlin of election interference. One of the Trump team’s toughest voices on Russia, he said in a speech last week that there was “clear evidence of Russia meddling in democratic elections in the U.S. and Europe,” and he called it part of an “active threat of a recently resurgent Russia.”

Tillerson’s focus on Ukraine came as he met with European diplomats at the Organization for Security and Cooperation in Europe, established during the Cold War to serve as a bridge between East and West. Tillerson insisted the U.S. could never overlook Russia’s “attempted annexation” of Crimea or Moscow’s military intrusion in eastern Ukraine.

“We should be clear about the source of this violence,” Tillerson said. “Russia is arming, leading, training and fighting alongside anti-government forces.”

Trump campaigned on the need to improve ties with Russia, Tillerson said, adding that “normalizing” relations between the nuclear powers was something the U.S. still “badly would like to do.” He said that from the start, the Trump administration had told Moscow that addressing Ukraine was essential to warmer ties.

“We can have differences in other arenas, in Syria. We can have differences in other areas,” Tillerson said. “But when one country invades another, that is a difference that is hard to look past or to reconcile.”

The sharp rebuke of Russia came just before Tillerson met with Russian Foreign Minister Sergey Lavrov. Seated around a large table with their aides, the two said nothing of substance when journalists were allowed in for a few seconds to witness the start of their meeting.

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Tillerson met later with OSCE special monitors who track the security situation in Ukraine — including one injured by a hand grenade. The secretary of state said he’d made progress with the Russian diplomat, though he declined to tell reporters what it was.

“We get dialogue, we get cooperation. We don’t have it solved,” Tillerson said. “You don’t solve it in one meeting.”

The strained ties between the two countries were also palpable in Moscow’s description of the meeting. The Russian Foreign Ministry said Lavrov had told Tillerson that aggressive U.S. military rhetoric about North Korea is “impermissible.” The Russian statement also included an unusual allegation: that the United States is trying to recruit Russian journalists in the U.S. as spies.

Earlier, in remarks at the OSCE conference, Lavrov acknowledged no fault in his country’s actions in Ukraine. He said Kiev was dragging its heels regarding proposals for U.N. peacekeepers, as well as obstructing several international channels set up to try to reduce violence and move toward a resolution to the conflict.

“The whole responsibility for it lies with the Ukrainian authorities,” Lavrov said.

Although he didn’t bring up election concerns Thursday, Tillerson did briefly mention long-standing U.S. tensions with Russia over Syria. The Kremlin has propped up Syrian President Bashar Assad while the U.S. has aligned itself with opposition groups seeking his ouster.

Washington and Moscow have worked to ensure their militaries, both active in Syria in recent years, don’t accidentally end up in confrontation. Yet there are growing U.S. concerns that Russia’s significant influence in Syria will make it harder to resolve the war there and to limit Iranian influence in the country now that the Islamic State group in Syria is near defeat.

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Reach Josh Lederman on Twitter at http://twitter.com/joshlederman