U.S. President Donald Trump speaks to reporters before leaving the White House in Washington D.C., the United States, on Oct. 10, 2019. (Photo by Ting Shen/Xinhua)

Trump cautioned Turkey against actions beyond limits.

"Turkey knows where I stand ... We are going to possibly do something very, very tough with respect to sanctions and other financial things."

WASHINGTON, Oct. 11 (Xinhua) -- U.S. President Donald Trump said on Thursday that he hopes to mediate between Turkey and the Syrian Kurds, and also threatened to punish Turkey if its offensive in northeast Syria goes beyond limits.

Trump tweeted Thursday that the United States has three options regarding the situation in Syria: "Send in thousands of troops and win Militarily, hit Turkey very hard Financially and with Sanctions, or mediate a deal between Turkey and the Kurds!"

"I hope we can mediate," Trump told the press later when he was asked about the three options.

Photo taken on Oct. 9, 2019 shows the northern Syrian city of Ras al-Ain which is under Turkish military attack, as seen from the southern Turkish border town of Ceylanpinar. (Photo by Mustafa Kaya/Xinhua)

Trump also cautioned Turkey against actions beyond limits. "Turkey knows where I stand ... We are going to possibly do something very, very tough with respect to sanctions and other financial things," Trump noted without elaborating.

A senior state department official reaffirmed Trump's warning to Turkey in a teleconference briefing later in the day, saying that the United States is willing to impose significant costs if "Turkey acts in a way that is disproportionate, inhumane, or otherwise goes beyond the lines that the President has in his own mind."

The official also revealed that Turkey had, at various levels and for multiple times, asked for U.S. military support for its military operation, which the United States had rejected.

Republican Senator Lindsey Graham and Democratic Senator Chris Van Hollen on Wednesday announced a framework for sanctions against Turkey for its ongoing military campaign in northeast Syria.

The framework includes sanctions on senior Turkish government officials and prohibition of all U.S. military business and transactions with Turkey, among others.

Turkish Foreign Minister Mevlut Cavusoglu responded on Thursday that Turkey would retaliate if the United States imposed sanctions over its offensive into northeast Syria, according to media reports.

Turkey regards the Kurdish-led Syrian Democratic Forces (SDF) as an extension of Turkey's Kurdistan Workers' Party, which is listed as a terrorist organization by Turkey, while the United States considers the SDF an ally in the fight against the Islamic State.

Vehicles of the Turkish army head for Akcakale near the border between Turkey and Syria on Oct. 9, 2019. (Photo by Mustafa Kaya/Xinhua)

Earlier Wednesday, Turkey launched military operations targeting the Kurdish forces in several parts of northeast Syria after the United States started pulling its troops out of there following a recent decision.

Syrian Foreign Ministry condemned the Turkish military offensive on Kurdish positions in northern and northeastern Syria, stressing the Syrian government's determination to confront the "Turkish aggression by all means." ■