KYIV–Ukraine’s biggest political party said on Tuesday it will rate the performance of Prime Minister Arseny Yatseniuk’s government as “unsatisfactory” in an imminent vote that could precipitate a collapse of the coalition government and snap elections. Parliament could vote as early as Tuesday on a report that reviews the government’s performance in 2015 and its agenda for this year. The final time and day of the vote has not been confirmed. If the government loses, lawmakers need 150 signatures in parliament to hold a no-confidence vote, which could lead to national elections if the coalition cannot agree on a new cabinet. Two legislators told Reuters they had already secured the signatures.