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US President Joe Biden
Photo: Susan Walsh/AP
The Pentagon is expected to announce on Wednesday that more US troops will be stationed in Eastern Europe in the coming days.
President Joe Biden has given permission to do so, CNN and the Wall Street Journal report.
More than 3,000 US soldiers are said to be deployed in Eastern Europe "in the coming days".
2000 are stationed from the United States in Poland and Germany, around 1000 are transferred from Germany to Romania.
The deployment of the troops was a sign of support for NATO allies who felt threatened by Russia's military moves near Ukraine, US government officials were quoted as saying.
The troops will cooperate with their host countries on a bilateral basis.
Last week, the United States and NATO responded in writing to Russian demands for "security guarantees."
In the letters, Washington and NATO rejected a declaration by NATO to renounce further eastward expansion and the withdrawal of US weapons from states in the former Soviet sphere of influence, as demanded by Russian President Vladimir Putin.
According to Russia, it is still working on a formal reply.
The US and NATO suspect Putin of planning an invasion of neighboring Ukraine.
The Kremlin rejects this.
as/Reuters