Swiss leadership fears that sending President Simonetta Sommaruga or Foreign Minister Didier Burkhalter to Moscow may offend Kiev. Ukraine's Foreign Ministry spokesman said last week bilateral relations may be on the line if foreign states accept Moscow's invitation, thus displaying "solidarity with the aggressor."
On Friday, meanwhile, Washington urged countries to take into account the events in Ukraine before considering Moscow's invitation to attend the Victory Day commemoration.
"The Federal Council has not decided yet," the federation's executive body spokesman Andre Simonazzi told the publication, while the Federal Department of Foreign Affairs declined to comment.
At least 25 state leaders have so far accepted Moscow's invitation. A full list of the participants in the events will be announced by the end of April 2015.
