Possible but we do not know. Especially with winter. Their supply situation will be terrible. Roads and railways in Ruthenia are going in west-east direction, built by Czechoslovaks to guarantee connection with allied Romania. Just realized, one more reason Hungarians need Slovaks in. To allow them supply routs to Poland through their much more suited road and railway network through mountains. Do you know how Ruthenian and Slovak border with Poland look like? If I was Tiso I would use it to negotiate return of Slovak territory lost in March war.