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Only two EU nations have as yet committed to placing troops in Ukraine and only in the event of a peace deal as a peacekeeping force. Russia has already rejected this idea, stating that it is a red line for them. Whether or not this ever comes to fruition remains to be seen. If there ever is any physical NATO presence in Ukraine it will be entirely insufficient to fight against Russia and will do everything to avoid conflict with Russia. It could be that there will be no protection under article 5 as the USA has already suggested as much previously.
In short, no is the answer to your question.
In short, no is the answer to your question.