Russia’s army is gaining speed in its advance in eastern Ukraine, seizing more land last week than at any point this year, increasing pressure on Kyiv’s U.S. and European allies to bolster its defenses.

The gain of more than 200 square kilometers adds to territory taken in a grinding summer offensive that’s involved huge losses of Russian troops and equipment.

Russia has captured 1,146 square kilometers in Ukraine since Aug. 6, about a quarter more than in the first seven months of the year, according to Bloomberg Intelligence calculations based on changes recorded by the DeepState map service that’s maintained in cooperation with the Ukrainian Defense Ministry.