WASHINGTON - US President Donald Trump said Tuesday that his 10-day "deadline" for Moscow to end the conflict with Ukraine is in effect, cutting short the 50-day timeline he announced two weeks ago.

Russia has "10 days from today" to reach a ceasefire agreement, Trump told reporters on his flight back to Washington following his visit to Scotland. Otherwise, "We're going to put on tariffs and stuff," he added.

ALSO READ: Trump: 50-day deadline for ceasefire deal in Ukraine may be shortened

On July 14, Trump threatened Russia with "severe tariffs" unless it agrees to a ceasefire with Ukraine within 50 days. He shortened the deadline to "10 or 12 days" on Monday during his meeting with British Prime Minister Keir Starmer, citing disappointment with "Moscow's lack of willingness to compromise."

READ MORE: Trump says not necessary to fire Powell after getting fed tour

In response, the Kremlin said it has "taken note of" Trump's statement, and its special operation in Ukraine continues.

"The special military operation continues," Kremlin spokesman Dmitry Peskov said Tuesday, noting, "We also remain committed to the peace process to resolve the conflict around Ukraine and to ensuring our interests in the course of this settlement."