FRANKFURT, April 2 (Reuters) - Austria's Raiffeisen Bank International, the biggest Western bank in Russia, said on Tuesday it "stands by" its assessment that its purchase of a stake in Austria's Strabag long held by a Russian tycoon complied with sanctions laws.

But the bank also said the deal for the Strabag stake, which has faced scrutiny of U.S. government officials, "requires extensive compliance verifications" following a recent transfer.

(Reporting by Tom Sims; Editing by Jan Harvey)