Follow US immigration and US investment: According to a report by the British "Daily Mail" on February 23, the United States has warned Russia against sending troops into Ukraine after the interim president of Ukraine expressed a desire for closer ties with the European Union.
US President Obama's National Security Advisor Rice stated in an interview with NBC on the 23rd that it would be a "grave mistake" for Russia to send troops to Ukraine, and that the division of Ukraine is not in the interests of Ukraine, Russia, the European Union, or the United States.
Analysts point out that the above remarks by Rice are the clearest statement from the US side since the outbreak of the Ukraine crisis.
On the 22nd, a series of dramatic changes occurred in the situation in Ukraine: President Yanukovych fled Kyiv, and the parliament quickly decided to release former Prime Minister Tymoshenko. The new interim president, Turchynov, stated that he is willing to engage in dialogue with Russia, provided that the latter recognizes Ukraine's choice regarding the European Union.