The contention that India's foreign policy has increasingly adopted a 'more aggressive hyper-realist posture' and that this gained new momentum after the Pahalgam terrorist strike in 2000 is largely agreeable. While the shift wasn't solely attributable to Pahalgam, this incident, along with others, contributed significantly to a hardening of India's stance, moving away from a purely defensive or reactive approach to one that is more assertive and willing to project power.

Historically, India's foreign policy, particularly in response to cross-border terrorism, was often characterized by strategic restraint, diplomatic pressure, and a reliance on international condemnation. This approach, rooted in its non-aligned principles and a desire to avoid escalation, often led to frustration domestically and a perception of weakness internationally. The Pahalgam attack, where terrorists massacred pilgrims, underscored the vulnerability of India to such acts and the limitations of a purely diplomatic response.

The aftermath of Pahalgam, and subsequent major attacks like the 2001 Indian Parliament attack and the 2008 Mumbai attacks, gradually pushed India towards a more robust and proactive security doctrine. This 'hyper-realist posture' can be understood as an approach that prioritizes national security and interests above all else, is less constrained by ideological considerations, and is willing to consider and employ all instruments of state power, including military force, to achieve its objectives.

Key manifestations of this shift include:

1. Proactive Counter-Terrorism: A greater willingness to consider and execute pre-emptive or retaliatory strikes against terrorist infrastructure across borders. While the 'Cold Start' doctrine (though never officially acknowledged) emerged earlier, the political will to act on such doctrines became more evident. The 2016 surgical strikes following the Uri attack and the 2019 Balakot airstrike after Pulwama are prime examples of this new assertiveness, demonstrating a clear departure from past restraint.
2. Diplomatic Assertiveness: India has become more vocal and uncompromising in international forums regarding state-sponsored terrorism, actively working to isolate countries that harbor or support terrorist groups. This includes pushing for global conventions on terrorism and naming and shaming perpetrators.
3. Enhanced Defence Capabilities: Increased investment in military modernization, intelligence gathering, and special forces capabilities to effectively respond to security threats.
4. Strategic Partnerships: A pragmatic approach to forming strategic partnerships with countries like the US, Israel, and France, which share similar security concerns and can provide advanced defence technology and intelligence cooperation.

While India continues to value diplomacy and multilateralism, the 'hyper-realist' shift signifies a recognition that these alone are insufficient to address persistent security challenges. It reflects a more confident and capable India, willing to use its growing power to protect its interests. The Pahalgam attack, therefore, was a significant moment that contributed to this evolving momentum, pushing India towards a more decisive and less hesitant approach to national security.