BRUSSELS (AP) – President Joe Biden is sending approximately 2,000 troops from Fort Bragg, North Carolina, to Poland and Germany this week and sending part of an infantry Stryker squadron of roughly 1,000 troops based in Germany to Romania, a senior administration official said Wednesday.

The military moves come amid stalled talks with Russia over its military buildup at Ukraine’s borders. The move underscores growing fears across Europe that Russian President Vladimir Putin is poised to invade Ukraine – and smaller NATO countries on the eastern flank worry they could be next.

The official spoke on the condition of anonymity to discuss military moves not yet announced.

In announcing the moves Wednesday, Pentagon press secretary John Kirby said they will happen in coming days and operate under U.S. command.

“These are not permanent moves,” he said, stressing that the purpose is to reassure allies at a time of heightened tension over Russia’s unusual buildup of military forces along Ukraine’s border.

It also said the Biden administration had previously announced 8,500 troops would be on alert but did not commit to deploying them.

Defense Secretary Lloyd Austin and Army Gen. Mark Milley, chairman of the Joint Chiefs of Staff, said the U.S. has taken into account the risk that any troop movements could inflame the situation, but stressed the need for America to reassure its allies.

Washington and Moscow have been at loggerheads over Ukraine, with little sign of a diplomatic path forward. A Spanish newspaper on Wednesday reported that the United States could be willing to enter into an agreement with Russia to ease tensions over missile deployments in Europe if Moscow steps back from the brink in Ukraine.

The daily El Pais published two documents purported to be written replies from the United States and NATO last week to Russia’s proposals for a new security arrangement in Europe. The U.S. State department declined to comment on them.

In reference to the second document, NATO said that it never comments on “alleged leaks.” But the text closely reflects statements made to the media last week by NATO Secretary-General Jens Stoltenberg as he laid out the 30-nation military organization’s position on Russia’s demands.

The U.S. document, marked as a confidential “non-paper,” said that the United States would be willing to discuss in consultation with its NATO partners “a transparency mechanism to confirm the absences of Tomahawk cruise missiles at Aegis Ashore sites in Romania and Poland.”

That would happen on condition that Russia “offers reciprocal transparency measures on two ground-launched missiles bases of our choosing in Russia.”

Aegis Ashore is a system for defending against short- or intermediate-range missiles. Russia argues the site in Romania could be easily adapted to fire cruise missiles instead of interceptors, which ram their target and do not carry warheads, a claim that Washington has denied.

Russian President Vladimir Putin again mentioned the possibility Tuesday, saying that “there are MK-41 launchers there that could be configured for firing Tomahawks.” He said they “are offensive systems that could reach thousands of kilometers into our territory. Isn’t that a threat to us?”

The U.S. document said Washington would have to consult with NATO allies on the potential offer, particularly with Romania and Poland.

Kremlin spokesman Dmitry Peskov refused to comment on the leaked documents, saying only that “we didn’t release anything.” In comments to the state RIA Novosti news agency, Russia’s Foreign Ministry also refused to confirm or deny that the documents published by El Pais were authentic.

Fears of a Russian invasion of Ukraine have mounted in recent months, after Putin deployed more than 100,000 troops to areas near Ukraine’s borders, including in neighboring Belarus, backed by tanks, artillery, helicopters and warplanes. Russian officials have insisted that Moscow has no intention of invading.

The U.S. underlined after its written proposals in the leaked document that “progress can only be achieved on these issues in an environment of de-escalation with respect to Russia’s threatening actions towards Ukraine.”

In his first public remarks on the standoff in more than a month, Putin on Tuesday accused the U.S. and its allies of ignoring Russia’s central security demands but he said that Moscow is willing to talk more to ease tensions over Ukraine.

His remarks suggested that a potential Russian invasion may not be imminent and that at least one more round of diplomacy is likely.

After talks in Kyiv Wednesday with Ukrainian President Volodymyr Zelenskyy, Dutch Prime Minister Mark Rutte underlined that “it is essential for dialogue to continue.” If not, Rutte, said, “it is clear that further aggression against Ukraine will have serious consequences.”

Russia’s military buildup has already taken a toll on Ukraine’s economy, but Zelenskyy said his government has taken steps to calm the markets and the local currency, the hryvnia. He said Ukraine has also boosted its combat and armed forces capabilities, but underlined that “we think only about peace and de-occupation of (our) territories, solely through diplomatic means.”

Notable in its absence from the leaked documents is any mention of Ukraine’s hopes of joining NATO. Putin has demanded that NATO stop taking in any new members and withdraw its troops and equipment from countries that joined the alliance since 1997, almost half its ranks.

In the leaked document linked to NATO, the 30 allies said they “reaffirm our commitment to NATO’s Open Door policy,” without specifically mentioning Ukraine. Under Article 10 of NATO’s founding treaty, other European countries may be invited in if they further the goals of European security.

At a NATO summit in 2008, NATO leaders said that they welcomed “Ukraine’s and Georgia’s Euro-Atlantic aspirations for membership in NATO,” adding: “We agreed today that these countries will become members of NATO.”

Russia invaded Georgia later that year, and in 2014 annexed Ukraine’s Crimean Peninsula. Around 14,000 people have been killed in the conflict that still simmers in eastern Ukraine. Their membership plans have been on hold for years, although NATO continues to support them and promote reforms.

The U.S. already has between 75,000 and 80,000 troops in Europe as permanently stationed forces and as part of regular rotations in place such as Poland.

This is a breaking news update and CBS 17 will update this story as more information becomes available.