WASHINGTON (AP) \u2014 In what would be a reversal, the Biden administration is poised to approve sending M1 Abrams tanks to Ukraine, U.S. officials said Tuesday, as international reluctance to send tanks to the battlefront against the Russians begins to erode. A decision to send a bit more than 30 tanks could be announced as soon as Wednesday, though it could take months for the tanks to be delivered. U.S. officials said details are still being worked out. One official said the tanks would be bought under an upcoming Ukraine Security Assistance Initiative package, which provides longer-range funding for weapons and equipment to be purchased from commercial vendors. The U.S. announcement is expected in coordination with an announcement by Germany that it will approve Poland\u2019s request to transfer German-made Leopard 2 tanks to Ukraine, according to one official. The officials spoke on condition of anonymity because the decision has not yet been made public. By agreeing to send the Abrams at an as-yet unspecified time under the assistance initiative, the administration is able to meet German Chancellor Olaf Scholz's demand for an American commitment without having to send the tanks immediately. Much of the aid sent so far in the 11-month-old war has been through a separate program drawing on Pentagon stocks to get weapons more quickly to Ukraine. But even under that program, it would take months to get tanks to Ukraine and to get Ukrainian forces trained on them. It wasn't clear Tuesday how soon the U.S. will start training Ukrainian troops on the Abrams and roughly how soon they can get to the battlefront. Until now, the U.S. has resisted providing its own M1 Abrams tanks to Ukraine, citing extensive and complex maintenance and logistical challenges with the high-tech vehicles. Washington believes it would be more productive to send German Leopards since many allies have them and Ukrainian troops would need less training than on the more difficult Abrams. Just last week, Under Secretary of Defense for Policy Colin Kahl told reporters that the Abrams is a complicated, expensive, difficult to maintain and hard to train on piece of equipment. One thing Defense Secretary Lloyd Austin has been very focused on, he said, "is that we should not be providing the Ukrainians systems they can\u2019t repair, they can\u2019t sustain, and that they, over the long term, can\u2019t afford, because it\u2019s not helpful.\u201d A U.S. official familiar with White House thinking said the administration\u2019s initial hesitancy was based on concerns about the requisite training and the sustainment of the tanks. The official added that the administration believes that such plans are now in place, but it could take time to implement them. At the Pentagon, spokesman Brig. Gen. Pat Ryder said he had nothing to announce on any U.S. decision regarding Abrams tanks. But he said, \u201canytime that we\u2019ve provided Ukraine with a type of system, we\u2019ve provided the training and sustainment capabilities with that.\u201d The administration's reversal comes just days after a coalition of more than 50 senior defense officials from Europe and beyond met in Germany to discuss Ukraine\u2019s war needs, and battle tanks were a prime topic. Ukrainian leaders have been urgently requesting tanks, but Germany had resisted mounting pressure either to supply its own tanks or clear the way for other countries, such as Poland, to send the German-made tanks from their own stocks. Kremlin spokesman Dmitry Peskov said the deployment of Western tanks would trigger \u201cunambiguously negative\u201d consequences. Defense leaders from the countries that have Leopard 2 tanks met with the Germans during the Friday conference at Ramstein Air Base in an effort to hammer out an agreement. On Sunday, Berlin indicated it wouldn\u2019t stand in the way if other countries wanted to send the Leopard 2 tanks to Kyiv. Germany needs to agree for the tanks to be given to Ukraine, which is not a member of NATO. U.S. and German officials have given mixed signals about whether the U.S. and German decisions are linked, and whether Berlin was hesitant to send its tanks unless the U.S. sent Abrams. Polish Defense Minister Mariusz B\u0142aszczak said Tuesday that Poland has officially requested permission from Germany to transfer its Leopard 2 battle tanks to Ukraine. German officials confirmed to the dpa news agency they had received the application and said it would be assessed \u201cwith due urgency.\u201d German Foreign Minister Annalena Baerbock said Sunday that Berlin wouldn\u2019t seek to stop Poland from providing the high-tech armor to Kyiv. German officials declined to comment on the reports of a tank deal. The news weekly Der Spiegel reported Tuesday, without citing a source, that Germany will provide Ukraine with at least one company of Leopard 2 tanks from its own army\u2019s stock. A company comprises 15 tanks. Scholz is due to deliver an address to parliament Wednesday and field questions from lawmakers, many of whom have been pressing the government to join allies in providing the tanks to Ukraine. Lawmakers in Congress have also been pushing the U.S. to beef up its aid to Ukraine. Senate Republican leader Mitch McConnell said Tuesday \u201cit\u2019s time, past time\u201d for the Biden administration and allies to send more military aid to Ukraine, and that the U.S. must provide more tanks and weapons to help Ukraine \u201cwin this war.\u201d \u201cIt\u2019s time, past time, for the Biden administration and our allies to get serious about helping Ukraine finish the job and retake their country.\u201d The likely plans to send the Abrams were first reported by The Wall Street Journal. ____ Associated Press writers Tara Copp, Kevin Freking and Aamer Madhani contributed to this report.