MOSCOW — President Vladimir Putin on Sunday said the United States would have to cut 755 diplomatic staff in Russia and warned of a prolonged gridlock in its ties after the US Congress backed new sanctions against the Kremlin. Putin added bluntly that Russia was able to raise the stakes with America even further, although he hoped this would be unnecessary. A US State Department official denounced the move as a “regrettable and uncalled for act,” adding that Washington was now weighing a potential response. On Friday, the Russian foreign ministry demanded Washington cut its diplomatic presence in Russia by Sept. 1 to 455 people — the same number Moscow has in the US. Putin added that an upturn in Russia’s relations with Washington could not be expected “any time soon.” “We have waited long enough, hoping that the situation would perhaps change for the better,” he said. “But it seems that even if the situation is changing, it’s not for any time soon.” Putin warned that Russia could further ratchet up the pressure, but he hoped this would not be needed. — AFP