* Could signal easing of Russia, Belarus spat
* Presidents meet again
* Uralkali employees appeal for CEO's release-company
MINSK, Sept 26 (Reuters) - The chief executive of Russian potash producer Uralkali has been moved from jail to house arrest in Belarus, signalling that a diplomatic spat over the collapse of a sales cartel could be nearing an end.
Vladislav Baumgertner was detained while visiting Belarus on Aug. 26, about a month after Uralkali withdrew from a marketing alliance with state-owned miner Belaruskali, an important source of income for Belarus.
He has since been held in a KGB prison in Minsk and could face up to 10 years in jail on charges of abuse of office.
"He was transferred to house arrest yesterday," Dmitry Goryachko, Baumgertner's lawyer, told Reuters.
Russia said last week it expected Belarus to hand over Baumgertner soon, and the development came after the country's presidents and prime ministers discussed his arrest at separate meetings this week.
Uralkali said on Thursday that 6,000 of its employees had signed an appeal to Belarussian President Alexander Lukashenko, asking for the release of their chief executive and expressing confidence in a swift resolution.
"We all hope that the company's CEO will be released soon. I am sure that the support expressed by Uralkali's employees is of considerable importance under the current circumstances," acting chief executive Victor Belyakov said in a statement.
Russian President Vladimir Putin met Lukashenko again on Thursday when the allies held joint military manoeuvres in Belarus and in Kaliningrad, a Russian outpost between Poland and Lithuania on the Baltic Sea.
But while Putin's spokesman said they may have discussed the situation surrounding Uralkali, their meetings produced no sign of an agreement to return Baumgertner to Russia. An expected joint appearance before reporters never materialised.
Lukashenko has said he is ready to repatriate Baumgertner, but wants a change of ownership in Uralkali that would restore strong commercial links between Belarus and Moscow.
Russian billionaire Mikhail Prokhorov's investment vehicle Onexim joined a list of potential bidders for a stake in Uralkali after China's sovereign wealth fund, China Investment Corp, acquired a 12.5 percent stake on Tuesday.
Tycoon Suleiman Kerimov and his partners own 33 percent of Uralkali, the leading producer of the fertiliser ingredient that together with Belaruskali had controlled two-fifths of the $20 billion world market.
Sources familiar with Kerimov's situation say the search continues for a buyer acceptable to both the Kremlin and Lukashenko who could act as a peacemaker, smoothing business and diplomatic ties between the ex-Soviet neighbours.
Yet with a Chinese investor on board chances of restoring the cartel may have diminished, analysts say. Potash producers are increasingly selling direct rather than via alliances, pushing down prices by as much as a quarter.