REUTERS/Elizabeth FrantzWASHINGTON, Feb 28 (Reuters) - The United States does not expect Russia to make significant territorial gains in Ukraine in the near-term, a senior Pentagon official said on Tuesday, describing the front lines in the year-long war as a "grinding slog." Kahl made the remarks during a hearing focused on oversight of the billions of dollars in military aid Washington has provided to Kyiv. In October, the U.S. restarted on-site inspections in Ukraine to help keep track of the billions of dollars of weapons being provided to Kyiv. One of the weapons the U.S. has not provided -- despite public appeals by Ukrainian officials -- are F-16 fighter jets. Kahl was asked repeatedly by lawmakers about sending the jets to Ukraine.

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