Analysis Summary:

The article's accuracy is mixed. While the snippet suggests a demand for a ceasefire and Russia's rejection, the provided sources, dated in March 2025, discuss ceasefire proposals and conditions, but don't directly confirm the specific "end of day" ultimatum mentioned in the NY Times article dated May 12, 2025. The article exhibits moderate bias through its framing of the EU's demand and Russia's dismissive response.

Detailed Analysis:

• Claim:** E.U. Leaders Demand Russia Accept Ukraine Cease-fire by End of Day.
  • Verification Source #3: Mentions "European leaders pressure Russia over 30-day Ukraine ceasefire" but doesn't specify an "end of day" ultimatum or the date of the demand.
  • Verification Source #1, #2, #4, #5: Do not directly cover the specific claim of an "end of day" ultimatum from EU leaders.
• Verdict:* Unverified. The sources discuss ceasefire proposals and pressure from various actors, but none confirm the specific ultimatum described in the NY Times article.
• Claim:** The Kremlin brushed off the threat of further sanctions, saying that “the language of ultimatums is unacceptable.”
  • Verification Source #1, #2, #3, #4, #5: None of the sources directly quote the Kremlin using the phrase "the language of ultimatums is unacceptable" in response to a specific EU demand. However, they do describe Russia's responses to ceasefire proposals, which often involve setting conditions or expressing skepticism.
• Verdict:* Partially Verified. While the exact quote is not found, the general sentiment of Russia rejecting demands and conditions is supported by the sources.

Supporting Evidence/Contradictions:

• Agreement:** Several sources (Verification Source #1, #2, #3, #4) confirm that ceasefire negotiations and proposals were ongoing in March 2025.
• Disagreement/Lack of Coverage:** None of the sources directly contradict the claim of an "end of day" ultimatum from the EU, but they also don't confirm it. The sources are dated earlier than the NY Times article, so this could be new information.
• Supporting Evidence:** Verification Source #3: "European leaders pressure Russia over 30-day Ukraine ceasefire." This supports the general idea of European leaders putting pressure on Russia regarding a ceasefire.
• Supporting Evidence:** Verification Source #2: "Pressure is now on Putin as Ukraine agrees to Trump's ceasefire proposal..." This supports the idea that Russia was facing pressure regarding ceasefire proposals.