The United States has no Viking red line on the issue of US military deployment in Ukraine as part of the peacekeeping mission. This was reported by the Politico newspaper related to a senior official.

I don't think there are red lines. <...> So I think, this is still found, officially said.
The dialogue of the publication added that US President Donald Trump wants Europeans to become more positive. At the same time, the source does not exclude that the US leader may agree with the participation of the United States in peacekeeping missions for a period of time.
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At the same time, as a permanent representative of the United States with NATO Matthew Witker, said on August 18, the US security guarantee from the United States is not necessarily the position of the US military in its territories. According to him, we can talk about the commander and commander of the army. The representative permanently emphasized that from the end in this matter, it is still with Trump.
Matthew Whitker also said that Europe should be provided to ensure security for Ukraine, they also have to pay them.