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Sri Lanka
Practice Relating to Rule 20. Advance Warning
In 2011, in its Humanitarian Operation Factual Analysis July 2006–May 2009, Sri Lanka’s Ministry of Defence stated:
X. General Operational Procedures and Preparations to Safeguard Civilian Lives
B. Sri Lanka Army
228. Multiple warnings for civilians were provided as needed prior to attacks, and used sophisticated technology to confirm the departure of civilians and minimise collateral damage. 
Sri Lanka, Ministry of Defence, Humanitarian Operation Factual Analysis July 2006–May 2009, July 2011, § 228.
The Ministry of Defence further stated: “On 18 May 2009, Sri Lanka defeated the LTTE, bringing to an end three decades of conflict and suffering.” 
Sri Lanka, Ministry of Defence, Humanitarian Operation Factual Analysis July 2006–May 2009, July 2011, § 12.