By Vladimir Soldatkin MOSCOW (Reuters) -Natural gas supplies between Poland and Germany via the Russian Yamal-Europe pipeline came to a halt on Wednesday, data from the German network operator Gascade showed, dashing expectations it was about to pump gas west for the first time since December. Russian gas supplies to Europe have come under scrutiny as thousands of Russian troops have massed near the border of traditional gas transit nation Ukraine, raising fears of an invasion. The West has accused Russia of deliberately withholding gas and helping to drive prices to record levels, in part to …