UK Foreign Secretary Lord Cameron has said it is up to Ukraine to decide how to use British weapons and insisted it has the right to strike targets on Russian territory.
During a visit to Kyiv, he said the UK would provide £3bn ($3.75bn) per year for as long as necessary.
"Just as Russia is striking inside Ukraine, you can quite understand why Ukraine feels the need to make sure it's defending itself," Lord Cameron said.
Russia condemned what it called "another very dangerous statement".
"This is a direct escalation of tension around the Ukrainian conflict, which would potentially pose a threat to European security," said Kremlin spokesman Dmitry Peskov.
Lord Cameron did not directly endorse the idea of British weapons being used to strike targets inside Russia.
But until now, the UK has generally let it be understood - without spelling it out - that weapons such as the long range Storm Shadow missile should only be used inside sovereign Ukrainian territory. There have been several examples of its successful use in Russian-occupied Crimea, including against elements of Russia’s Black Sea Fleet.
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