Finland’s government said Thursday that it would extend the closure of its long border with Russia for another two months until April 14, because it sees no signs that Moscow was stopping its “hybrid operation” of funneling migrants toward the frontier with the Nordic nation.

Finland closed the 1,340-kilometer (832-mile) land border late last year after about 1,300 migrants without proper documentation or visas had arrived across the frontier since September — an unusually high number, just months after Finland joined the NATO alliance.

Most of the migrants hail from the Middle East and Africa. The vast majority of them have sought asylum in Finland, a nation of 5.6 million people.

The government said in Thursday’s statement that “instrumentalized migration” from Russia poses “a serious threat to Finland’s national security and public order.”

Based on the information provided by the border, security and other authorities to the Cabinet, “it is likely that instrumentalized migration would resume if border crossing points were opened at the eastern border,” the government said.