Before Russia invaded Ukraine, the United States and its allies were discussing deploying more troops to Eastern Europe.

Before Russia invaded Ukraine, the United States and its allies were discussing deploying more troops to Eastern Europe. The United States and some allies will deploy thousands more troops to NATO countries in Eastern Europe before Russia invades Ukraine as a show of support in the face of ongoing Moscow attacks. Three U.S. officials familiar with the talks told CNN that they were in talks

Before Russia invaded Ukraine, the United States and its allies were discussing deploying more troops to Eastern Europe.

Romania, Bulgaria, and Hungary are among the countries considering deployment. Each country of deployment has approximately 1,000 personnel and is similar to the Forward Combat Group currently based in the Baltic states and Poland.

According to European diplomats, the United States and the United Kingdom are among those considering new pre-aggression deployments, but not all of NATO's 30 members are happy.

NATO allies are not on the same page about the seriousness of the threat, for example, Germany is refusing to sell new weapons to Ukraine. Therefore, the United States is arguing for sending additional troops on a bilateral basis, or as one official explained, as an "alliance of the willing."

In general, the U.S. military's goal is to "meet" the needs of NATO allies in the region, another defense official said last week. The US military can operate unilaterally in Europe, as it has already done, but it can also operate under the existing NATO command structure.

The possibility of deploying several troops near the Russian gateway before the attack indicates a change of government, which had previously warned Moscow of the risk of further provocation. The move could be armed by the Kremlin as an example of an aggressive NATO position Russia is using to justify troop build-up on the Ukrainian border.

A Pentagon spokesman, John Kirby, said Monday that the United States had issued a warning to 8,500 troops if a NATO response force was called in. However, most of these units are aimed at activities supported by the full NATO alliance. The United States and NATO already have several thousand more troops in Europe to deploy additional allies to Eastern Europe.

Kirby told CNN on Tuesday that some troops were also on alert. "We can move these troops in a very short time because it takes time," President Joe Biden said Tuesday, referring to "concerns" for US Eastern European allies. There is a "reason" for this.

President Biden initially planned to speak to the public earlier this week about the situation in Russia, but it is unclear whether the White House will continue to engage diplomatically with Russia.

The military plan comes as the United States becomes increasingly concerned that a further Russian invasion of Ukraine could occur at any time and with urgent notice.

"When I say it's imminent, it's still imminent," White House spokeswoman Jane Sackie told a daily briefing on Tuesday. "However, we cannot predict what Putin will decide. We are still engaged in diplomatic talks and negotiations."

Ukrainian officials on Tuesday pushed back Saki, saying the situation in Russia was "dangerous" but not "imminent."

Sources close to the Ukrainian leadership said Tuesday that the defense secretary and intelligence chief had analyzed satellite images of Russian troops "every hour" from the United States and other Western agencies, but that Russia had "entered war mode," or attacked.

Sources added that Ukraine believes it will still take a week or two for Russian troops to be ready near the border if a Russian attack order is issued.

A written response to Russia's security demands that US officials could present to the Kremlin on Wednesday could give the United States room to discuss NATO's open-door policy, which is less than President Vladimir Putin's central dissatisfaction. Thus, there are concerns within the administration that Moscow could use the U.S. response as an excuse for diplomatic failure.

Correction: This story has been updated to clarify that the United States and its allies are discussing the deployment of about 1,000 troops in Eastern European countries, including Romania, Bulgaria, and Hungary.