Here are a few options for a formal title, depending on the desired emphasis:

Option 1 (Direct and Analytical): “Strategic Implications of the Kremlin’s Linguistic Shift: Peskov’s Acknowledgment of ‘War’ Analyzed”

Option 2 (Policy-Oriented): “Analyzing the Narrative Shift: Center for Countering Disinformation Examines Peskov’s Use of the Term ‘War'”

Option 3 (Concise and Formal): “Reassessing the Kremlin’s Rhetoric: Implications of Peskov’s Shift to the Terminology of ‘War'”

Recommendation: Option 1 is the most professional and suitable for a report or formal publication.

Here are a few options for a formal equivalent, depending on your focus:

• From Twitter to X: The Enduring Dominance and Polarization of a Social Media Giant
• The Evolution of X: Analyzing Two Decades of Influence and Controversy
• Two Decades of X: The Persistent Influence of a Polarizing Social Platform

Recommendation: The first option is the most balanced for a professional or academic context.

Here are a few options for a formal rewrite, depending on your focus:

• Presidency Denounces Misinformation Campaign
• Presidency Issues Rebuttal Against Misinformation Campaign
• Presidency Dismisses Ongoing Misinformation Campaign

“Presidency Denounces Misinformation Campaign” is the most standard and professional choice for a news headline.