Ukraine's 'rapid' incursion into Kursk shows it's learned from months of grinding warfare, military analysts say

• Russia has waged a war of attrition in eastern Ukraine this year, resulting in marginal and costly gains.
• Ukraine's "rapid" incursion into Kursk shows it has learned from the fighting there, analysts said.
• The Institute for the Study of War pointed to the "stark contrast" in territory taken by both sides.

Ukraine's swift incursion into the Russian border region of Kursk shows it has learned valuable lessons from months of war in its eastern provinces, according to military experts.