The Stock Exchange of Thailand index ended 4.92 points higher on Monday, amid mixed performance throughout Asia after Crimea's referendum on Sunday.
However, foreigners, which had accumulated Thai shares in the previous days, were net-sellers today, with net-sell position of Bt1.5 billion.
Asian markets were mixed Monday on renewed concerns over Ukraine after Crimea voted to break away from the former Soviet republic and join Russia, leading the West to warn of further sanctions against Moscow.
Investors remain cautious following a sell-off last week fuelled by weak Chinese data, while eyes are on the Federal Reserve's policy meeting on Tuesday and Wednesday to see if it will announce any more stimulus cuts.
Tokyo slipped 0.35 per cent, or 49.99 points, to 14,277.67 and Sydney shed 0.22 per cent, or 11.8 points, to 5,317.6.
But Shanghai climbed 0.96 per cent, or 19.33 points, to 2,023.673 while Seoul added 0.40 per cent, or 7.63 points, to end at 1,927.53. Hong Kong fell 0.30 per cent, or 65.54 points. to 21,473.95.
Crimea voted overwhelmingly Sunday to join Russia, further fuelling tensions in the worst crisis between Moscow and the West since the Cold War.
While people in the predominantly Russian-speaking peninsula celebrated the result of the poll, Ukraine's new pro-European leaders and the West branded it "illegal".
The vote was organised after Russian forces seized de facto control of the region and pro-Moscow authorities took power in response to the ouster of Ukraine's pro-Kremlin leader Viktor Yanukovych in February.
US President Barack Obama told his Russian counterpart Vladimir Putin in a phone call after the vote that a referendum that "occurred under duress of Russian military intervention, would never be recognised by the United States and the international community".
He said the US and its European allies were "prepared to impose additional costs on Russia for its actions".
"We've anticipated the results of the referendum. The key is what sanctions the US and the Europe will carry out and how Russia will respond to them," said Masaru Ishibashi, head of the currency trading group at Sumitomo Mitsui Banking Corp.
And Osao Iizuka, head of foreign-exchange trading at Sumitomo Mitsui Trust Bank, told Dow Jones Newswires: "A further escalation of military tensions would lead to more risk-averse trading."