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- The US recently green-lit strikes by Ukraine on targets in Russia using its weapons.
- But its placing strict limits on which ones can be used and where.
- A think tank said the restrictions were holding Ukraine back.
Ukraine appears to have had only minor success in using US-supplied weapons to strike targets inside Russia because of the strict limits imposed by President Joe Biden.
Last month, Biden said that Ukraine could fire US weapons against targets on Russian soil, in limited circumstances.