The Kremlin on Tuesday criticised US President Donald Trump's threat to raise tariffs on India over its purchases of Russian oil, a key source of revenue for Moscow's military offensive on Ukraine.

Trump has given Moscow until Friday to make progress on a peace deal with Kyiv or face new economic sanctions that could include punishments on countries that purchase Russia's vital oil and gas exports.

Trump on Monday specifically threatened India with higher tariffs, prompting New Delhi to brand any potential move "unjustified and unreasonable".