Russian President Vladimir Putin on Thursday blasted Washington’s "unconstructive position" on Syria after the Kremlin said the United States declined to host a high-level delegation from Moscow.

Russian President Vladimir Putin on Thursday blasted Washington's "unconstructive position" on Syria after the Kremlin said the United States declined to host a high-level delegation from Moscow.

"I believe this is an unconstructive position," Putin said on a visit to the Central Asian nation of Kazakhstan.

"I don't quite understand how our American partners can criticize Russia's actions in Syria in the fight against international terrorism if they refuse to hold direct dialogue even in such an important area as political settlement."

"What apparently lies at the heart of the weakness of the American position is a lack of any kind of agenda," Putin said in televised remarks.

"It looks like they have nothing to talk about."

"Nevertheless, we are keeping our doors open and very much hope for dialogue with all the participants of this complicated process, including with our American partners."

Earlier this week Putin said he was willing to send a high-profile delegation to the United States led by Prime Minister Dmitry Medvedev.

Late last month Moscow launched a bombing campaign in Syria, saying it needed to target the terrorist groups and gunmen operating against the Syrian government across the country.