New Delhi, July 16 -- President Donald Trump on Tuesday downplayed the possibility of sending Ukraine long-range weapons as Kyiv awaits an injection of U.S. weaponry that it hopes will help it beat back an intensifying Russian air offensive.

Trump offered a more cautious tone on what to expect after he threatened Russia a day earlier with steep tariffs if President Vladimir Putin doesn't act within 50 days to end the three-year conflict. He also on Monday announced plans to bolster Kyiv's stockpile by selling American weapons to NATO allies who would in turn send arms to Ukraine.

Providing Ukraine with more long-range weaponry would give Kyiv the chance to strike further into Russian territory, a move that some in Ukraine and the U.S. h...